Documentation of Re-exports is missing

[hanjoosten]

The documentation of rio-prettyprint should contain the same documentation as the original definitions that it re-exports.
I am not sure there is a feature in haddock that supports this. If not, this is a good usecase to request such a feature.

[mpilgrem]

@hanjoosten, agreed on the documentation. The problem is that the 're-exports' are not, in fact, re-exports. They are isomorphic - for example nest :: Int -> Doc a -> Doc a becomes nest :: Int -> StyleDoc -> StyleDoc.