Added note to tutorial part #2 about possible mismatch with the Django version...

Added note to tutorial part #2 about possible mismatch with the Django version being used regarding changes in location of django.conf.urls[.defaults] symbols. Thansk Carl for the suggestion.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16970 bcc190cf-cafb-0310-a4f2-bffc1f526a37