Demand signature grammar

[Ben Gamari]

Hello everyone,

I routinely find myself having to dig through the Outputable instances
in Demand.Types to decipher our joint demand signature syntax. Tonight I
finally broke down and extracted a BNF-like grammar summarizing the
syntax. It can be found on the Wiki [1]. I hope it is helpful for others
as well.

Cheers,

- Ben


[1] https://gitlab.haskell.org/ghc/ghc/-/wikis/commentary/compiler/demand
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