[1.0.X] Fixed #9675: added note about upgrading the URLconf to the comment...

[1.0.X] Fixed #9675: added note about upgrading the URLconf to the comment upgrade guide. Backport of [10746] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10748 bcc190cf-cafb-0310-a4f2-bffc1f526a37