Added note to docs/add_ons.txt about reading the source code.
Added note to docs/add_ons.txt about reading the source code.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%403251

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