twistedchecker warns on methods of inner classes that don't have docstrings

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If I do this:

def foo():
    """
    a nice docstring
    """
    blub = blub()
    @implementer(ISomePublicInterface)
    class Bar(object):
        def baz(self):
            return blub
    return Bar()

I should not need to write a docstring for Bar.baz; it's just tedious makework. Our coding standard definitely doesn't require docstrings for callbacks, and methods on inner classes are in the same category of thing.