[1.1.X] Fixed bad indentation in contenttypes code example so that cut and...

[1.1.X] Fixed bad indentation in contenttypes code example so that cut and paste from doc will work. 

r12253 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12254 bcc190cf-cafb-0310-a4f2-bffc1f526a37