[1.2.X] Fixed #15375 -- clarified apparent contradiction in Form Wizard...

[1.2.X] Fixed #15375 -- clarified apparent contradiction in Form Wizard documentation. Thanks to codysomerville for the report.

Backport of r15633 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15634 bcc190cf-cafb-0310-a4f2-bffc1f526a37