[DOCS] Update 12 VisualScript* nodes

doc/classes/VisualScriptSelf.xml

@@ -1,8 +1,14 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="VisualScriptSelf" inherits="VisualScriptNode" category="Core" version="3.0.alpha.custom_build">
 	<brief_description>
+		Outputs a reference to the current instance.
 	</brief_description>
 	<description>
+		Provides a reference to the node running the visual script.
+		[b]Input Ports:[/b]
+		none
+		[b]Output Ports:[/b]
+		- Data (object): [code]instance[/code]
 	</description>
 	<tutorials>
 	</tutorials>