[1.0.X] Added a link to the "documentation" documentation in the contributing docs.

should use the ".. versionchanged:: X.Y" directive (with the same format as the

``versionadded`` mentioned above.

There's a full page of information about the :ref:`Django documentation

system <internals-documentation>` that you should read prior to working on the

documentation.

Guidelines for ReST files

-------------------------