[1.1.X] Fixed #10878, an error in the `Moderator` docstring.

    models registered for comment moderation, and their associated

    moderation classes, and apply moderation to all incoming comments.

    To register a model, obtain an instance of ``CommentModerator``

    (this module exports one as ``moderator``), and call its

    ``register`` method, passing the model class and a moderation

    class (which should be a subclass of ``CommentModerator``). Note

    that both of these should be the actual classes, not instances of

    the classes.

    To register a model, obtain an instance of ``Moderator`` (this

    module exports one as ``moderator``), and call its ``register``

    method, passing the model class and a moderation class (which

    should be a subclass of ``CommentModerator``). Note that both of

    these should be the actual classes, not instances of the classes.

    To cease moderation for a model, call the ``unregister`` method,

    passing the model class.