Revision of docs (#10)

* Port updates back to chapter 2

* Update older visuals to match new format

* Update older visuals to match new format

* update docs

4 files changed, 233 insertions, 230 deletions

diff --git a/chapter02/docs/02-post-peephole-ex1.gv b/chapter02/docs/02-post-peephole-ex1.gv
index a39d602b..290a1178 100644
--- a/chapter02/docs/02-post-peephole-ex1.gv
+++ b/chapter02/docs/02-post-peephole-ex1.gv
@@ -1,10 +1,11 @@
-digraph chapter02
-{
-	Start1 [shape=box,  label="Start"];
-	Con213 [ label="Con2"];
-	Start1 -> Con213 [style=dotted];
-	Return14 [shape=box,  label="Return"];
-	Con213 -> Return14;
-	edge [color=red];
-	Start1 -> Return14;
+digraph chapter02 {
+	rankdir=BT;
+	subgraph cluster_Nodes {
+		Start1 [ shape=box style=filled fillcolor=yellow label="Start" ];
+		Con213 [ label="Con2" ];
+		Return14 [ shape=box style=filled fillcolor=yellow label="Return" ];
+	}
+	Con213 -> Start1 [style=dotted];
+	Return14 -> Start1 [color=red];
+	Return14 -> Con213;
 }
\ No newline at end of file
diff --git a/chapter02/docs/02-post-peephole-ex1.svg b/chapter02/docs/02-post-peephole-ex1.svg
index 33aa5a95..b3c42c7d 100644
--- a/chapter02/docs/02-post-peephole-ex1.svg
+++ b/chapter02/docs/02-post-peephole-ex1.svg
@@ -1,51 +1,53 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
-        "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
 <!-- Generated by graphviz version 2.43.0 (0)
  -->
 <!-- Title: chapter02 Pages: 1 -->
-<svg width="106pt" height="188pt"
-     viewBox="0.00 0.00 106.45 188.00" xmlns="http://www.w3.org/2000/svg">
-    <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 184)">
-        <title>chapter02</title>
-        <polygon fill="white" stroke="transparent" points="-4,4 -4,-184 102.45,-184 102.45,4 -4,4"/>
-        <!-- Start1 -->
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-            <text text-anchor="middle" x="65.45" y="-158.3" font-family="Times,serif" font-size="14.00">Start</text>
-        </g>
-        <!-- Con213 -->
-        <g id="node2" class="node">
-            <title>Con213</title>
-            <ellipse fill="none" stroke="black" cx="34.45" cy="-90" rx="34.39" ry="18"/>
-            <text text-anchor="middle" x="34.45" y="-86.3" font-family="Times,serif" font-size="14.00">Con2</text>
-        </g>
-        <!-- Start1&#45;&gt;Con213 -->
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-            <title>Start1&#45;&gt;Con213</title>
-            <path fill="none" stroke="black" stroke-dasharray="1,5"
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-            <path fill="none" stroke="red"
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-        <!-- Con213&#45;&gt;Return14 -->
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+<svg width="128pt" height="220pt"
+ viewBox="0.00 0.00 128.00 220.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 216)">
+<title>chapter02</title>
+<polygon fill="white" stroke="transparent" points="-4,4 -4,-216 124,-216 124,4 -4,4"/>
+<g id="clust1" class="cluster">
+<title>cluster_Nodes</title>
+<polygon fill="none" stroke="black" points="8,-8 8,-204 112,-204 112,-8 8,-8"/>
+</g>
+<!-- Start1 -->
+<g id="node1" class="node">
+<title>Start1</title>
+<polygon fill="yellow" stroke="black" points="83,-196 29,-196 29,-160 83,-160 83,-196"/>
+<text text-anchor="middle" x="56" y="-174.3" font-family="Times,serif" font-size="14.00">Start</text>
+</g>
+<!-- Con213 -->
+<g id="node2" class="node">
+<title>Con213</title>
+<ellipse fill="none" stroke="black" cx="70" cy="-106" rx="34.39" ry="18"/>
+<text text-anchor="middle" x="70" y="-102.3" font-family="Times,serif" font-size="14.00">Con2</text>
+</g>
+<!-- Con213&#45;&gt;Start1 -->
+<g id="edge1" class="edge">
+<title>Con213&#45;&gt;Start1</title>
+<path fill="none" stroke="black" stroke-dasharray="1,5" d="M66.61,-123.95C65.07,-131.65 63.21,-140.97 61.47,-149.64"/>
+<polygon fill="black" stroke="black" points="57.98,-149.23 59.46,-159.72 64.85,-150.61 57.98,-149.23"/>
+</g>
+<!-- Return14 -->
+<g id="node3" class="node">
+<title>Return14</title>
+<polygon fill="yellow" stroke="black" points="92,-52 26,-52 26,-16 92,-16 92,-52"/>
+<text text-anchor="middle" x="59" y="-30.3" font-family="Times,serif" font-size="14.00">Return</text>
+</g>
+<!-- Return14&#45;&gt;Start1 -->
+<g id="edge2" class="edge">
+<title>Return14&#45;&gt;Start1</title>
+<path fill="none" stroke="red" d="M45.44,-52.03C38.44,-61.91 30.63,-74.95 27,-88 22.71,-103.41 23.04,-108.5 27,-124 29.38,-133.3 33.76,-142.73 38.42,-151"/>
+<polygon fill="red" stroke="red" points="35.54,-153.01 43.69,-159.78 41.54,-149.41 35.54,-153.01"/>
+</g>
+<!-- Return14&#45;&gt;Con213 -->
+<g id="edge3" class="edge">
+<title>Return14&#45;&gt;Con213</title>
+<path fill="none" stroke="black" d="M61.72,-52.3C62.93,-60.02 64.39,-69.29 65.74,-77.89"/>
+<polygon fill="black" stroke="black" points="62.3,-78.56 67.31,-87.9 69.22,-77.47 62.3,-78.56"/>
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+</g>
 </svg>
diff --git a/chapter02/docs/02-pre-peephole-ex1.gv b/chapter02/docs/02-pre-peephole-ex1.gv
index d5a16616..c2eab457 100644
--- a/chapter02/docs/02-pre-peephole-ex1.gv
+++ b/chapter02/docs/02-pre-peephole-ex1.gv
@@ -1,27 +1,28 @@
-digraph chapter02
-{
-	Start1 [shape=box,  label="Start"];
-	Con12 [ label="Con1"];
-	Start1 -> Con12 [style=dotted];
-	Con23 [ label="Con2"];
-	Start1 -> Con23 [style=dotted];
-	Con34 [ label="Con3"];
-	Start1 -> Con34 [style=dotted];
-	Mul5 [ label="Mul"];
-	Con23 -> Mul5;
-	Con34 -> Mul5;
-	Con56 [ label="Con5"];
-	Start1 -> Con56 [style=dotted];
-	Minus7 [ label="Minus"];
-	Con56 -> Minus7;
-	Add8 [ label="Add"];
-	Mul5 -> Add8;
-	Minus7 -> Add8;
-	Add9 [ label="Add"];
-	Con12 -> Add9;
-	Add8 -> Add9;
-	Return10 [shape=box,  label="Return"];
-	Add9 -> Return10;
-	edge [color=red];
-	Start1 -> Return10;
+digraph chapter02 {
+	rankdir=BT;
+	subgraph cluster_Nodes {
+		Start1 [ shape=box style=filled fillcolor=yellow label="Start" ];
+		Con12 [ label="Con1" ];
+		Con23 [ label="Con2" ];
+		Con34 [ label="Con3" ];
+		Mul5 [ label="Mul" ];
+		Con56 [ label="Con5" ];
+		Minus7 [ label="Minus" ];
+		Add8 [ label="Add" ];
+		Add9 [ label="Add" ];
+		Return10 [ shape=box style=filled fillcolor=yellow label="Return" ];
+	}
+	Con12 -> Start1 [style=dotted];
+	Con23 -> Start1 [style=dotted];
+	Con34 -> Start1 [style=dotted];
+	Mul5 -> Con23;
+	Mul5 -> Con34;
+	Con56 -> Start1 [style=dotted];
+	Minus7 -> Con56;
+	Add8 -> Mul5;
+	Add8 -> Minus7;
+	Add9 -> Con12;
+	Add9 -> Add8;
+	Return10 -> Start1 [color=red];
+	Return10 -> Add9;
 }
\ No newline at end of file
diff --git a/chapter02/docs/02-pre-peephole-ex1.svg b/chapter02/docs/02-pre-peephole-ex1.svg
index dc33c7f5..8a1ef457 100644
--- a/chapter02/docs/02-pre-peephole-ex1.svg
+++ b/chapter02/docs/02-pre-peephole-ex1.svg
@@ -1,156 +1,155 @@
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-        "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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-        <!-- Con12 -->
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-            <ellipse fill="none" stroke="black" cx="46.34" cy="-162" rx="34.39" ry="18"/>
-            <text text-anchor="middle" x="46.34" y="-158.3" font-family="Times,serif" font-size="14.00">Con1</text>
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-        <!-- Start1&#45;&gt;Con12 -->
-        <g id="edge1" class="edge">
-            <title>Start1&#45;&gt;Con12</title>
-            <path fill="none" stroke="black" stroke-dasharray="1,5"
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-        <!-- Start1&#45;&gt;Con23 -->
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-            <title>Start1&#45;&gt;Con23</title>
-            <path fill="none" stroke="black" stroke-dasharray="1,5"
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+ viewBox="0.00 0.00 322.00 436.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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+<polygon fill="white" stroke="transparent" points="-4,4 -4,-432 318,-432 318,4 -4,4"/>
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+<polygon fill="none" stroke="black" points="8,-8 8,-420 306,-420 306,-8 8,-8"/>
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+<!-- Start1 -->
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+<text text-anchor="middle" x="90" y="-390.3" font-family="Times,serif" font-size="14.00">Start</text>
+</g>
+<!-- Con12 -->
+<g id="node2" class="node">
+<title>Con12</title>
+<ellipse fill="none" stroke="black" cx="70" cy="-178" rx="34.39" ry="18"/>
+<text text-anchor="middle" x="70" y="-174.3" font-family="Times,serif" font-size="14.00">Con1</text>
+</g>
+<!-- Con12&#45;&gt;Start1 -->
+<g id="edge1" class="edge">
+<title>Con12&#45;&gt;Start1</title>
+<path fill="none" stroke="black" stroke-dasharray="1,5" d="M62.43,-195.98C50.2,-225.92 29.16,-289.7 47,-340 50.66,-350.32 57.29,-360.1 64.26,-368.39"/>
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+<!-- Con23 -->
+<g id="node3" class="node">
+<title>Con23</title>
+<ellipse fill="none" stroke="black" cx="90" cy="-322" rx="34.39" ry="18"/>
+<text text-anchor="middle" x="90" y="-318.3" font-family="Times,serif" font-size="14.00">Con2</text>
+</g>
+<!-- Con23&#45;&gt;Start1 -->
+<g id="edge2" class="edge">
+<title>Con23&#45;&gt;Start1</title>
+<path fill="none" stroke="black" stroke-dasharray="1,5" d="M90,-340.3C90,-348.02 90,-357.29 90,-365.89"/>
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+<!-- Con34 -->
+<g id="node4" class="node">
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+<!-- Con34&#45;&gt;Start1 -->
+<g id="edge3" class="edge">
+<title>Con34&#45;&gt;Start1</title>
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+<polygon fill="black" stroke="black" points="116.98,-366.8 111.38,-375.8 121.37,-372.25 116.98,-366.8"/>
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+<!-- Mul5 -->
+<g id="node5" class="node">
+<title>Mul5</title>
+<ellipse fill="none" stroke="black" cx="161" cy="-250" rx="28.7" ry="18"/>
+<text text-anchor="middle" x="161" y="-246.3" font-family="Times,serif" font-size="14.00">Mul</text>
+</g>
+<!-- Mul5&#45;&gt;Con23 -->
+<g id="edge4" class="edge">
+<title>Mul5&#45;&gt;Con23</title>
+<path fill="none" stroke="black" d="M146.29,-265.5C136.65,-275 123.86,-287.62 112.91,-298.42"/>
+<polygon fill="black" stroke="black" points="110.34,-296.03 105.68,-305.54 115.26,-301.02 110.34,-296.03"/>
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+<!-- Mul5&#45;&gt;Con34 -->
+<g id="edge5" class="edge">
+<title>Mul5&#45;&gt;Con34</title>
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+<polygon fill="black" stroke="black" points="167.41,-294.76 173.05,-303.72 174.24,-293.2 167.41,-294.76"/>
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+<!-- Con56 -->
+<g id="node6" class="node">
+<title>Con56</title>
+<ellipse fill="none" stroke="black" cx="264" cy="-322" rx="34.39" ry="18"/>
+<text text-anchor="middle" x="264" y="-318.3" font-family="Times,serif" font-size="14.00">Con5</text>
+</g>
+<!-- Con56&#45;&gt;Start1 -->
+<g id="edge6" class="edge">
+<title>Con56&#45;&gt;Start1</title>
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+<!-- Minus7 -->
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+<text text-anchor="middle" x="252" y="-246.3" font-family="Times,serif" font-size="14.00">Minus</text>
+</g>
+<!-- Minus7&#45;&gt;Con56 -->
+<g id="edge7" class="edge">
+<title>Minus7&#45;&gt;Con56</title>
+<path fill="none" stroke="black" d="M254.97,-268.3C256.29,-276.02 257.88,-285.29 259.35,-293.89"/>
+<polygon fill="black" stroke="black" points="255.93,-294.63 261.07,-303.9 262.83,-293.45 255.93,-294.63"/>
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+<!-- Add8 -->
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+<ellipse fill="none" stroke="black" cx="161" cy="-178" rx="28.7" ry="18"/>
+<text text-anchor="middle" x="161" y="-174.3" font-family="Times,serif" font-size="14.00">Add</text>
+</g>
+<!-- Add8&#45;&gt;Mul5 -->
+<g id="edge8" class="edge">
+<title>Add8&#45;&gt;Mul5</title>
+<path fill="none" stroke="black" d="M161,-196.3C161,-204.02 161,-213.29 161,-221.89"/>
+<polygon fill="black" stroke="black" points="157.5,-221.9 161,-231.9 164.5,-221.9 157.5,-221.9"/>
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+<!-- Add8&#45;&gt;Minus7 -->
+<g id="edge9" class="edge">
+<title>Add8&#45;&gt;Minus7</title>
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+<polygon fill="black" stroke="black" points="222.56,-230.77 232.62,-234.09 226.83,-225.22 222.56,-230.77"/>
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+<!-- Add9 -->
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+<title>Add9</title>
+<ellipse fill="none" stroke="black" cx="70" cy="-106" rx="28.7" ry="18"/>
+<text text-anchor="middle" x="70" y="-102.3" font-family="Times,serif" font-size="14.00">Add</text>
+</g>
+<!-- Add9&#45;&gt;Con12 -->
+<g id="edge10" class="edge">
+<title>Add9&#45;&gt;Con12</title>
+<path fill="none" stroke="black" d="M70,-124.3C70,-132.02 70,-141.29 70,-149.89"/>
+<polygon fill="black" stroke="black" points="66.5,-149.9 70,-159.9 73.5,-149.9 66.5,-149.9"/>
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+<!-- Add9&#45;&gt;Add8 -->
+<g id="edge11" class="edge">
+<title>Add9&#45;&gt;Add8</title>
+<path fill="none" stroke="black" d="M87.55,-120.5C101.14,-130.96 120.18,-145.6 135.46,-157.35"/>
+<polygon fill="black" stroke="black" points="133.45,-160.22 143.51,-163.54 137.72,-154.67 133.45,-160.22"/>
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+<!-- Return10 -->
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+<polygon fill="yellow" stroke="black" points="92,-52 26,-52 26,-16 92,-16 92,-52"/>
+<text text-anchor="middle" x="59" y="-30.3" font-family="Times,serif" font-size="14.00">Return</text>
+</g>
+<!-- Return10&#45;&gt;Start1 -->
+<g id="edge12" class="edge">
+<title>Return10&#45;&gt;Start1</title>
+<path fill="none" stroke="red" d="M48.61,-52.09C42.9,-62.2 36.15,-75.45 32,-88 19.42,-126.09 17,-136.89 17,-177 17,-177 17,-177 17,-251 17,-291.54 17.45,-304.48 37,-340 42.87,-350.67 51.53,-360.62 60.16,-368.95"/>
+<polygon fill="red" stroke="red" points="57.93,-371.65 67.66,-375.84 62.66,-366.5 57.93,-371.65"/>
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+<!-- Return10&#45;&gt;Add9 -->
+<g id="edge13" class="edge">
+<title>Return10&#45;&gt;Add9</title>
+<path fill="none" stroke="black" d="M61.72,-52.3C62.93,-60.02 64.39,-69.29 65.74,-77.89"/>
+<polygon fill="black" stroke="black" points="62.3,-78.56 67.31,-87.9 69.22,-77.47 62.3,-78.56"/>
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