Layout extensions missing from documentation

Picking up this issue from

https://mail.haskell.org/pipermail/ghc-devs/2018-February/015373.html

seems like none of the extensions that alter or relax layout are documented currently. (AlternativeLayoutRule, AlternativeLayoutRuleTransitional, DoAndIfThenElse, NondecreasingIndentation, RelaxedLayout)

Edited Mar 10, 2019 by Simon Jakobi

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