Fix comments.
Fix comments.

[skip ci]

izgzhen/hadrian,bgamari/shaking-up-ghc,sdiehl/ghc,sdiehl/ghc,snowleopard/hadrian,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,snowleopard/shaking-up-ghc