[1.5.x] Removed implication that six is part of Python stdlib.
Backport of 45969bd from master
|@@ -362,7 +362,7 @@ Moved modules|
|Some modules were renamed in Python 3. The ``django.utils.six.moves``|
|-module (based on the :mod:`Python six.moves module <six.moves>`) provides a|
|+module (based on the :mod:`six.moves module <six.moves>`) provides a|
|compatible location to import them.|
|The ``urllib``, ``urllib2`` and ``urlparse`` modules were reworked in depth|