Fixed the same set of typos as were corrected in [14149], this time in the...

Fixed the same set of typos as were corrected in [14149], this time in the release notes. Thanks to Paul McMillan for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14151 bcc190cf-cafb-0310-a4f2-bffc1f526a37