[1.3.X] Fixed #6581 -- Moved documentation of...

[1.3.X] Fixed #6581 -- Moved documentation of django.contrib.auth.views.redirect_to_login to an own "Helper functions" section.

Backport form trunk (r16130).

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@16131 bcc190cf-cafb-0310-a4f2-bffc1f526a37