Fixed #20944 -- Removed inaccurate statement about View.dispatch().

        you can override the ``head()`` method. See

        :ref:`supporting-other-http-methods` for an example.

        The default implementation also sets ``request``, ``args`` and

        ``kwargs`` as instance variables, so any method on the view can know

        the full details of the request that was made to invoke the view.

    .. method:: http_method_not_allowed(request, *args, **kwargs)

        If the view was called with a HTTP method it doesn't support, this