Assign an URL to be the "admin link" of this page.
    Example::

        {% set_staff_url %}{% url 'admin:fluent_pages_page_change' page.id %}{% end_set_staff_url %}

def set_staff_url(parser, token):
    """
    Assign an URL to be the "admin link" of this page.
    Example::

        {% set_staff_url %}{% url 'admin:fluent_pages_page_change' page.id %}{% end_set_staff_url %}
    """
    nodelist = parser.parse(('end_set_staff_url',))
    parser.delete_first_token()
    return AdminUrlNode(nodelist)