Fixed #11509 -- Modified usage of "Web" to match our style guide in various...

Fixed #11509 -- Modified usage of "Web" to match our style guide in various documentation, comments and code. Thanks to timo and Simon Meers for the work on the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14069 bcc190cf-cafb-0310-a4f2-bffc1f526a37