doc: Make all module docs self-contained

modules/visual_script/doc_classes/VisualScriptSequence.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<class name="VisualScriptSequence" inherits="VisualScriptNode" category="Core" version="3.0-alpha">
+	<brief_description>
+		Executes a series of Sequence ports.
+	</brief_description>
+	<description>
+		Steps through a series of one or more output Sequence ports. The [code]current[/code] data port outputs the currently executing item.
+		[b]Input Ports:[/b]
+		- Sequence: [code]in order[/code]
+		[b]Output Ports:[/b]
+		- Sequence: [code]1[/code]
+		- Sequence: [code]2 - n[/code] (optional)
+		- Data (int): [code]current[/code]
+	</description>
+	<tutorials>
+	</tutorials>
+	<demos>
+	</demos>
+	<methods>
+		<method name="get_steps" qualifiers="const">
+			<return type="int">
+			</return>
+			<description>
+			</description>
+		</method>
+		<method name="set_steps">
+			<return type="void">
+			</return>
+			<argument index="0" name="steps" type="int">
+			</argument>
+			<description>
+			</description>
+		</method>
+	</methods>
+	<members>
+		<member name="steps" type="int" setter="set_steps" getter="get_steps">
+			The number of steps in the sequence.
+		</member>
+	</members>
+	<constants>
+	</constants>
+</class>