Fixed #22644 -- Clarified documentation for NamedUrlWizardView

.. class:: NamedUrlSessionWizardView

.. class:: NamedUrlCookieWizardView

There is a :class:`WizardView` subclass which adds named-urls support to the

wizard. By doing this, you can have single urls for every step. You can also

use the :class:`NamedUrlSessionWizardView` or :class:`NamedUrlCookieWizardView`

classes which preselect the backend used for storing information (server-side

sessions and browser cookies respectively).

``NamedUrlWizardView`` is a :class:`WizardView` subclass which adds named-urls

support to the wizard. This allows you to have separate URLs for every step.

You can also use the :class:`NamedUrlSessionWizardView` or :class:`NamedUrlCookieWizardView`

classes which preselect the backend used for storing information (Django sessions and

browser cookies respectively).

To use the named urls, you have to change the ``urls.py``.

To use the named URLs, you should not only use the :class:`NamedUrlWizardView` instead of

:class:`WizardView`, but you will also have to change your ``urls.py``.

Below you will see an example of a contact wizard with two steps, step 1 with

``"contactdata"`` as its name and step 2 with ``"leavemessage"`` as its name.

The :meth:`~WizardView.as_view` method takes two additional arguments:

Additionally you have to pass two more arguments to the

:meth:`~WizardView.as_view` method:

* a required ``url_name`` -- the name of the url (as provided in the ``urls.py``)

* an optional ``done_step_name`` -- the name of the done step, to be used in the URL

* ``url_name`` -- the name of the url (as provided in the urls.py)

* ``done_step_name`` -- the name in the url for the done step

Example code for the changed ``urls.py`` file::

This is an example of a ``urls.py`` for a contact wizard with two steps, step 1 named

``contactdata`` and step 2 named ``leavemessage``::

    from django.conf.urls import url