Fixed docs for add_context_submenu_item

doc/classes/EditorContextMenuPlugin.xml

@@ -61,7 +61,7 @@
 				    popup_menu.add_item("White")
 				    popup_menu.id_pressed.connect(_on_color_submenu_option)
 
-				    add_context_menu_item("Set Node Color", popup_menu)
+				    add_context_submenu_item("Set Node Color", popup_menu)
 				[/codeblock]
 			</description>
 		</method>