users-guide: Fix typo
users-guide: Fix typo

snoyberg/ghc,mettekou/ghc,sdiehl/ghc,mettekou/ghc,ezyang/ghc,shlevy/ghc,tjakway/ghcjvm,shlevy/ghc,vTurbine/ghc,snoyberg/ghc,sgillespie/ghc,snoyberg/ghc,vikraman/ghc,snoyberg/ghc,olsner/ghc,sgillespie/ghc,tjakway/ghcjvm,sdiehl/ghc,shlevy/ghc,ezyang/ghc,olsner/ghc,vTurbine/ghc,vikraman/ghc,vTurbine/ghc,sgillespie/ghc,tjakway/ghcjvm,tjakway/ghcjvm,sgillespie/ghc,shlevy/ghc,ezyang/ghc,mettekou/ghc,mettekou/ghc,vikraman/ghc,olsner/ghc,sgillespie/ghc,ezyang/ghc,sdiehl/ghc,sdiehl/ghc,snoyberg/ghc,ezyang/ghc,ezyang/ghc,olsner/ghc,shlevy/ghc,sdiehl/ghc,sdiehl/ghc,tjakway/ghcjvm,snoyberg/ghc,vTurbine/ghc,tjakway/ghcjvm,shlevy/ghc,vikraman/ghc,mettekou/ghc,olsner/ghc,vikraman/ghc,mettekou/ghc,vikraman/ghc,tjakway/ghcjvm,vikraman/ghc,olsner/ghc,shlevy/ghc,vTurbine/ghc,sgillespie/ghc,sgillespie/ghc,ezyang/ghc,sdiehl/ghc,snoyberg/ghc,vTurbine/ghc,mettekou/ghc,vTurbine/ghc,olsner/ghc