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minor doc bug about list fusion in GHC user's guide

First, the Users Guide (8.0.1.20161117) in section 10.32.6,List fusion, should mention length as a good consumer.

Secondly, it says: "If you want to write your own good consumers or producers, look at the Prelude definitions of the above functions to see how to do so." However if you go to https://hackage.haskell.org/package/base-4.9.0.0/docs/Prelude.html and look at the source code for length you end up at https://hackage.haskell.org/package/base-4.9.0.0/docs/src/Data.Foldable.html#length which is not a good consumer. I think the User's Guide should be changed to replace "Prelude" with "https://hackage.haskell.org/package/base-4.9.0.0/docs/src/GHC.List.html".

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