user-guide: Reformat warning lists
user-guide: Reformat warning lists

oldmanmike/ghc,mettekou/ghc,shlevy/ghc,sdiehl/ghc,sgillespie/ghc,vikraman/ghc,mettekou/ghc,olsner/ghc,mcschroeder/ghc,mettekou/ghc,sdiehl/ghc,snoyberg/ghc,ezyang/ghc,ezyang/ghc,vTurbine/ghc,mcschroeder/ghc,mcschroeder/ghc,tjakway/ghcjvm,nushio3/ghc,tjakway/ghcjvm,tjakway/ghcjvm,olsner/ghc,olsner/ghc,nushio3/ghc,mcschroeder/ghc,ezyang/ghc,snoyberg/ghc,sdiehl/ghc,oldmanmike/ghc,tjakway/ghcjvm,olsner/ghc,oldmanmike/ghc,vTurbine/ghc,ezyang/ghc,mcschroeder/ghc,mettekou/ghc,mettekou/ghc,sdiehl/ghc,snoyberg/ghc,sgillespie/ghc,sgillespie/ghc,vTurbine/ghc,oldmanmike/ghc,mcschroeder/ghc,vTurbine/ghc,mcschroeder/ghc,sdiehl/ghc,oldmanmike/ghc,sgillespie/ghc,shlevy/ghc,olsner/ghc,tjakway/ghcjvm,vTurbine/ghc,sgillespie/ghc,shlevy/ghc,vikraman/ghc,nushio3/ghc,snoyberg/ghc,ezyang/ghc,vTurbine/ghc,snoyberg/ghc,vikraman/ghc,shlevy/ghc,vikraman/ghc,sgillespie/ghc,shlevy/ghc,snoyberg/ghc,nushio3/ghc,sdiehl/ghc,ezyang/ghc,shlevy/ghc,oldmanmike/ghc,vTurbine/ghc,sdiehl/ghc,nushio3/ghc,mettekou/ghc,nushio3/ghc,oldmanmike/ghc,shlevy/ghc,tjakway/ghcjvm,snoyberg/ghc,olsner/ghc,ezyang/ghc,vikraman/ghc,tjakway/ghcjvm,vikraman/ghc,nushio3/ghc,mettekou/ghc,vikraman/ghc,sgillespie/ghc,olsner/ghc