Fixed #21941 -- Documented the kwargs param of django.conf.urls.url().

    url(regex, view, kwargs=None, name=None, prefix='')

The ``kwargs`` parameter allows you to pass additional arguments to the view

function or method. See :ref:`views-extra-options` for an example.

See :ref:`Naming URL patterns <naming-url-patterns>` for why the ``name``

parameter is useful.

3. Django runs through each URL pattern, in order, and stops at the first

   one that matches the requested URL.

4. Once one of the regexes matches, Django imports and calls the given

   view, which is a simple Python function (or a :doc:`class based view

   </topics/class-based-views/index>`). The view gets passed an

   :class:`~django.http.HttpRequest` as its first argument and any values

   captured in the regex as remaining arguments.

4. Once one of the regexes matches, Django imports and calls the given view,

   which is a simple Python function (or a :doc:`class based view

   </topics/class-based-views/index>`). The view gets passed the following

   arguments:

   * An instance of :class:`~django.http.HttpRequest`.

   * If the matched regular expression returned no named groups, then the

     matches from the regular expression are provided as positional arguments.

   * The keyword arguments are made up of any named groups matched by the

     regular expression, overridden by any arguments specified in the optional

     ``kwargs`` argument to :func:`django.conf.urls.url`.

5. If no regex matches, or if an exception is raised during any

   point in this process, Django invokes an appropriate