Complete the narrative for subclasses

Author: jeff5

docs/src/site/sphinx/plain-java-object-2/object-and-pytype.rst

@@ -86,6 +86,9 @@ to any named method (``__len__`` for example):
     add --> xadd
 
 
+
+.. _Representation-builtin-list-dict:
+
 Simple Sub-classes of  ``list``
 -------------------------------