user-guide/safe_haskell: Fix typos
user-guide/safe_haskell: Fix typos

(cherry picked from commit 0dc230879ae2f8b7f6d97779631ba0847e415f24)

GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc,GaloisInc/halvm-ghc