Fixed #14988 - Remove renaming step in tutorial that's no longer applicable...

Fixed #14988 - Remove renaming step in tutorial that's no longer applicable due to generic view refactor.  Thanks bindzus for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15106 bcc190cf-cafb-0310-a4f2-bffc1f526a37