Link to suggestions for how to use super().

Doc/library/functions.rst

@@ -1335,6 +1335,10 @@ available.  They are listed here in alphabetical order.
    argument form specifies the arguments exactly and makes the appropriate
    references.
 
+   For practical suggestions on how to design cooperative classes using
+   :func:`super`, see `guide to using super()
+   <http://rhettinger.wordpress.com/2011/05/26/super-considered-super/>`_.
+
    .. versionadded:: 2.2