Added 'sitemaps' to docs/add_ons.txt
Added 'sitemaps' to docs/add_ons.txt

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3697 bcc190cf-cafb-0310-a4f2-bffc1f526a37

--HG--
extra : convert_revision : 26fd3bcdcfe50dfce01a3ed6dfaf8d5fbec4db43

heracek/django-nonrel,adieu/django-nonrel,adieu/django-nonrel,heracek/django-nonrel,heracek/django-nonrel,adieu/django-nonrel