Added clarification to 'Using branches' in docs/contributing.txt
Added clarification to 'Using branches' in docs/contributing.txt

git-svn-id: http://code.djangoproject.com/svn/django/trunk@1762 bcc190cf-cafb-0310-a4f2-bffc1f526a37

--HG--
extra : convert_revision : 0fd404edc00374d25f14fd48b43e3d91bc96df29

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