[1.0.X] In the release process doc, clarify that the original committer is...

[1.0.X] In the release process doc, clarify that the original committer is responsible for backporting trunk fixes to the bug-fix branch.

r9610 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9611 bcc190cf-cafb-0310-a4f2-bffc1f526a37