What does the star (*) in instance documentation mean?

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In the MonadState doc page, there's a star (*) inside the ReaderT type of the MonadState instance:

MonadState s m => MonadState s (ReaderT * r m)

But actually in the source, there's no star:

instance MonadState s m => MonadState s (ReaderT r m) where

So what does the star mean in the doc?

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