Fixed #9675: added note about upgrading the URLconf to the comment upgrade guide.

      new comment, and ``{% render_comment_form %}``, which renders said form

      using the ``comments/form.html`` template.

    * The way comments are include in your URLconf have changed; you'll need to

      replace::

            (r'^comments/', include('django.contrib.comments.urls.comments')),

      with::

            (r'^comments/', include('django.contrib.comments.urls')),

Upgrading data

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