[1.0.X] Fixed #11356 -- Added links to the growing collection of 3rd party...

[1.0.X] Fixed #11356 -- Added links to the growing collection of 3rd party database backends that are available. Thank to Nathan Auch for the draft text.

Merge of r11093 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@11098 bcc190cf-cafb-0310-a4f2-bffc1f526a37