Add more details about the 304 in cond diagram

guide/rest_cond.svg

@@ -64,9 +64,9 @@
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@@ -93,7 +93,7 @@
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-        <dc:title></dc:title>
+        <dc:title />
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@@ -1347,8 +1347,8 @@
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@@ -1356,8 +1356,8 @@
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@@ -1365,8 +1365,8 @@
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+         x="599.28265"
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+         y="980.47302">304 not modified</tspan></text>
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@@ -1445,7 +1445,7 @@
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+         y="562.35938">method is GET/HEAD?</tspan></text>
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@@ -1544,5 +1544,113 @@
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