Fixed #8486: Corrected some file attribute names in the request/response docs....

Fixed #8486: Corrected some file attribute names in the request/response docs. Thanks to mrsanders for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8518 bcc190cf-cafb-0310-a4f2-bffc1f526a37