doc: Make all module docs self-contained

modules/visual_script/doc_classes/VisualScriptIterator.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="VisualScriptIterator" inherits="VisualScriptNode" category="Core" version="3.0-alpha">
+	<brief_description>
+		Steps through items in a given input.
+	</brief_description>
+	<description>
+		This node steps through each item in a given input. Input can be any sequence data type, such as an [Array] or [String]. When each item has been processed, execution passed out the [code]exit[/code] Sequence port.
+		[b]Input Ports:[/b]
+		- Sequence: [code]for (elem) in (input)[/code]
+		- Data (variant): [code]input[/code]
+		[b]Output Ports:[/b]
+		- Sequence: [code]each[/code]
+		- Sequence: [code]exit[/code]
+		- Data (variant): [code]elem[/code]
+	</description>
+	<tutorials>
+	</tutorials>
+	<demos>
+	</demos>
+	<methods>
+	</methods>
+	<constants>
+	</constants>
+</class>