L{incremental.Version} that the callable
        was deprecated in.

    @param replacement: what should be used in place of the callable. Either
        pass in a string, which will be inserted into the warning message,
        or a callable, which will be expanded to its full import path.
    @type replacement: C{str} or callable

    @return: A string describing the deprecation.
    @rtype: C{str}
    )