Fixed #8870 -- Changed django.contrib.comments templates to use lowercase...

Fixed #8870 -- Changed django.contrib.comments templates to use lowercase 'post' for <form method> attributes, to be consistent with our other templates. Thanks, zgoda

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9050 bcc190cf-cafb-0310-a4f2-bffc1f526a37