Clarified a bit of the {% url %} documentation. Fixes #7714.

takes a client ID (here, ``client()`` is a method inside the views file

``app_views.py``). The URLconf line might look like this::

    ('^client/(\d+)/$', 'app_views.client')

    ('^client/(\d+)/$', 'project_name.app_name.app_views.client')

If this app's URLconf is included into the project's URLconf under a path

such as this::

...then, in a template, you can create a link to this view like this::

    {% url app_views.client client.id %}

    {% url project_name.app_name.app_views.client client.id %}

The template tag will output the string ``/clients/client/123/``.