Fixed #6502 -- Documented `context_instance` argument of `render_to_response`,...

Optional arguments

------------------

``context``

``dictionary``

    A dictionary of values to add to the template context. By default, this

    is an empty dictionary. If a value in the dictionary is callable, the

    view will call it just before rendering  the template.

``context_instance``

    The context instance to render the template with. By default, the template

    will be rendered with a ``Context`` instance (filled with values from

    ``dictionary``). If you need to use `context processors`_, you will want to

    render the template with a ``RequestContext`` instance instead. Your code

    might look something like this::

        return render_to_response('my_template.html',

                                  my_data_dictionary,

                                  context_instance=RequestContext(request))

``mimetype``

    **New in Django development version:** The MIME type to use for the

    resulting document. Defaults to the value of the ``DEFAULT_CONTENT_TYPE``

    setting.

.. _`context processors`: ../templates_python/#subclassing-context-requestcontext

Example

-------