Proofread changes to docs/contributing.txt from [3771]
Proofread changes to docs/contributing.txt from [3771]

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%403833

Belgabor/django,Belgabor/django,Belgabor/django