[1.0.X] Fixed #9206 -- Clarified documentation of transaction handling in raw...

[1.0.X] Fixed #9206 -- Clarified documentation of transaction handling in raw SQL, and error recovery for Postgres. Thanks to Richard Davies for the suggestion and draft text.

Merge of r10655 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10657 bcc190cf-cafb-0310-a4f2-bffc1f526a37