Fixed #14227 -- Added information about the "easy-pickings" keyword to the...

Fixed #14227 -- Added information about the "easy-pickings" keyword to the contributing docs. Thanks to Russ for the report and cmheisel for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14154 bcc190cf-cafb-0310-a4f2-bffc1f526a37