[1.8.x] Fixed #25963 -- Clarified render_to_response() context_instance deprecation.

:class:`~django.template.RequestContext`, pass the request separately in the

``request`` parameter.

If you're using ``context_instance=RequestContext(request))`` with

``render_to_response()``, use :func:`django.shortcuts.render`, which always

makes ``RequestContext`` available, instead. For example::

    from django.shortcuts import render_to_response

    from django.template import RequestContext

    render_to_response('template.html', {...}, context_instance=RequestContext(request))

becomes::

    from django.shortcuts import render

    render(request, 'template.html', {...})

``dirs`` argument of template-finding functions

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    .. deprecated:: 1.8

       The ``context_instance`` argument is deprecated. Simply use ``context``.

       The ``context_instance`` argument is deprecated. Use the :func:`render`

       function instead which always makes ``RequestContext`` available.

``content_type``

    The MIME type to use for the resulting document. Defaults to the value of