Added 'subclass' to docs/contributing.txt docs style guidelines
Added 'subclass' to docs/contributing.txt docs style guidelines

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5568 bcc190cf-cafb-0310-a4f2-bffc1f526a37

--HG--
extra : convert_revision : 24a3b0f78fdafc5fd845018138099c8835209ef6

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