A small documentation PR on github

[Alexander Kjeldaas]

Hi devs!

I created a small documentation PR for the GHC FFI on github and noticed
that there's another one-liner PR from May 2019 that was not merged.

https://github.com/ghc/ghc/pull/260
https://github.com/ghc/ghc/pull/255

Just checking that simple PRs are still accepted on github.

Alexander
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