[DOCS] Update 12 VisualScript* nodes

doc/classes/VisualScriptIterator.xml

@@ -1,8 +1,17 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <class name="VisualScriptIterator" inherits="VisualScriptNode" category="Core" version="3.0.alpha.custom_build">
 	<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>