Fixed #11031 -- Added doc for some additional roles needed when testing...

Fixed #11031 -- Added doc for some additional roles needed when testing Oracle.  Thanks JirkaV and Matt Boersma.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@10805 bcc190cf-cafb-0310-a4f2-bffc1f526a37