Style: Cleanup uses of double spaces between words

Or after punctuation. Tried to leave third-party stuff alone, unless it has
been heavily modified for Godot.

modules/visual_script/doc_classes/VisualScript.xml

@@ -4,7 +4,7 @@
 		A script implemented in the Visual Script programming environment.
 	</brief_description>
 	<description>
-		A script implemented in the  Visual Script programming environment. The script extends the functionality of all objects that instance it.
+		A script implemented in the Visual Script programming environment. The script extends the functionality of all objects that instance it.
 		[method Object.set_script] extends an existing object, if that object's class matches one of the script's base classes.
 		You are most likely to use this class via the Visual Script editor or when writing plugins for it.
 	</description>