[1.3.X] Fixed #16051 - Changed a "file" reference in the tutorial to be an...

[1.3.X] Fixed #16051 - Changed a "file" reference in the tutorial to be an actual file rather than a module; thanks felix.morency for the suggestion.

Backport of r16258 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.3.X@16259 bcc190cf-cafb-0310-a4f2-bffc1f526a37