Fixed #12525. Added a note to the validators doucmentation that models will not automatically run validators when saved, and a link to the ModelForm docs.
Fixed #12525. Added a note to the validators doucmentation that models will not automatically run validators when saved, and a link to the ModelForm docs.

git-svn-id: 554f83ef17aa7291f84efa897c1acfc5d0035373@12212 bcc190cf-cafb-0310-a4f2-bffc1f526a37

svn2github/django,svn2github/django,svn2github/django