[1.8.x] Fixed a function signature in docs/topics/auth/default.txt.

This is a list with all the views ``django.contrib.auth`` provides. For

implementation details see :ref:`using-the-views`.

.. function:: login(request, template_name=`registration/login.html`, redirect_field_name=, authentication_form, current_app, extra_context)

.. function:: login(request, template_name=`registration/login.html`, redirect_field_name='next', authentication_form=AuthenticationForm, current_app=None, extra_context=None)

    **URL name:** ``login``