[1.2.X] Added information about the "easy-pickings" keyword to the...

[1.2.X] Added information about the "easy-pickings" keyword to the contributing docs. Thanks to Russ for the report and cmheisel for the patch.

Backport of [14154] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14155 bcc190cf-cafb-0310-a4f2-bffc1f526a37