Merge pull request #34400 from alexchond/alexchon

Document DUPLICATE_USE_INSTANCING #2770

doc/classes/Node.xml

@@ -994,6 +994,7 @@
 		</constant>
 		<constant name="DUPLICATE_USE_INSTANCING" value="8" enum="DuplicateFlags">
 			Duplicate using instancing.
+			An instance stays linked to the original so when the original changes, the instance changes too.
 		</constant>
 	</constants>
 </class>