Documentation on has_perm and the permission_required decorator is confusing

(In [10371]) Fixed a whole bunch of small docs typos, errors, and ommissions.

Fixes #8358, #8396, #8724, #9043, #9128, #9247, #9267, #9267, #9375, #9409, #9414, #9416, #9446, #9454, #9464, #9503, #9518, #9533, #9657, #9658, #9683, #9733, #9771, #9835, #9836, #9837, #9897, #9906, #9912, #9945, #9986, #9992, #10055, #10084, #10091, #10145, #10245, #10257, #10309, #10358, #10359, #10424, #10426, #10508, #10531, #10551, #10635, #10637, #10656, #10658, #10690, #10699, #19528.

Thanks to all the respective authors of those tickets.

The documentation is still wrong: http://docs.djangoproject.com/en/dev/topics/auth/#django.contrib.auth.models.User.has_perm

It says "<application name>.<lowercased model name>" repeatedly (at least twice) in the documentation, when in fact it should be "<application name>.<lowercased permission codename>"

clarify has_perm arguments permissions

(In [11547]) Fixed #9414 -- Clarified the documentation on the permission decorators. Thanks to timo for the patch.

(In [11569]) [1.1.X] Fixed #9414 -- Clarified the documentation on the permission decorators. Thanks to timo for the patch.

Merge of r11547 from trunk.