doc: Make all module docs self-contained

modules/visual_script/doc_classes/VisualScriptCondition.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="VisualScriptCondition" inherits="VisualScriptNode" category="Core" version="3.0-alpha">
+	<brief_description>
+		A Visual Script node which branches the flow.
+	</brief_description>
+	<description>
+		A Visual Script node that checks a [bool] input port. If [code]true[/code] it will exit via the “true” sequence port. If [code]false[/code] it will exit via the "false" sequence port. After exiting either, it exits via the “done” port. Sequence ports may be left disconnected.
+		[b]Input Ports:[/b]
+		- Sequence: [code]if (cond) is[/code]
+		- Data (boolean): [code]cond[/code]
+		[b]Output Ports:[/b]
+		- Sequence: [code]true[/code]
+		- Sequence: [code]false[/code]
+		- Sequence: [code]done[/code]
+	</description>
+	<tutorials>
+	</tutorials>
+	<demos>
+	</demos>
+	<methods>
+	</methods>
+	<constants>
+	</constants>
+</class>