Document the return value of `EditorInspectorPlugin.parse_property`

doc/classes/EditorInspectorPlugin.xml

@@ -100,7 +100,7 @@
 			<argument index="5" name="usage" type="int">
 			</argument>
 			<description>
-				Called to allow adding property specific editors to the inspector. Usually these inherit [EditorProperty].
+				Called to allow adding property specific editors to the inspector. Usually these inherit [EditorProperty]. Returning [code]true[/code] removes the built-in editor for this property, otherwise allows to insert a custom editor before the built-in one.
 			</description>
 		</method>
 	</methods>