Added notes about `select_for_update` to the 1.4 release notes.
Added notes about `select_for_update` to the 1.4 release notes.

git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@16059 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django