Fixed #12469 - Add a few clarifications to the ModelAdmin.get_urls() docs....

                )

                return my_urls + urls

            def my_view(self, request):

                # custom view which should return an HttpResponse

                pass

    .. note::

        Notice that the custom patterns are included *before* the regular admin

        anything, so you'll usually want to prepend your custom URLs to the

        built-in ones.

        In this example, ``my_view`` will be accessed at

        ``/admin/myapp/mymodel/my_view/`` (assuming the admin URLs are included

        at ``/admin/``.)

    However, the ``self.my_view`` function registered above suffers from two

    problems: