Change memcached package anchor in the basic doc
Related Sphinx warnings:
* docs/basics.rst:4: WARNING: Duplicate explicit target name: "memcached".
@@ -579,8 +579,8 @@ it is distributed and a good choice if you want to
share sessions outside of the process running CherryPy.
Requires that the Python
-`memcached <https://pypi.org/project/memcached>`__
-package is installed, which may be indicated by installing
+`memcached package <https://pypi.org/project/memcached>`_
+is installed, which may be indicated by installing
``cherrypy[memcached_session]``.
.. code-block:: ini
