[1.2.X] Clarified information on OPTIONS setting (for adding additional...

[1.2.X] Clarified information on OPTIONS setting (for adding additional parameters when connecting to a database) and linked to Database Backend docs. Thanks to chris@cwroofs for the report.

Backport of [14114] from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@14115 bcc190cf-cafb-0310-a4f2-bffc1f526a37