[1.3.X] Fixed #16293: Document a way to return dicts with column names from a...

[1.3.X] Fixed #16293: Document a way to return dicts with column names from a DB cursor. Backport of [16808] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@16809 bcc190cf-cafb-0310-a4f2-bffc1f526a37