wireproto: update reference to deleted addchangegroup()

Thanks to Yuya for catching this.

mercurial/wireproto.py

@@ -411,7 +411,7 b' class wirepeer(peer.peerrepository):'
         remote server as a bundle.
 
         When pushing a bundle10 stream, return an integer indicating the
-        result of the push (see localrepository.addchangegroup()).
+        result of the push (see changegroup.apply()).
 
         When pushing a bundle20 stream, return a bundle20 stream.