Fix docs typo.
Fix docs typo.

Signed-off-by: Edward Z. Yang <dbd597f5635f432486c5d365e9bb585b3eaa1853@cs.stanford.edu>

wxwxwwxxx/ghc,olsner/ghc,AlexanderPankiv/ghc,ghc-android/ghc,urbanslug/ghc,bitemyapp/ghc,sgillespie/ghc,nathyong/microghc-ghc,snoyberg/ghc,nkaretnikov/ghc,elieux/ghc,holzensp/ghc,ml9951/ghc,ezyang/ghc,acowley/ghc,urbanslug/ghc,ghc-android/ghc,christiaanb/ghc,sdiehl/ghc,sdiehl/ghc,sdiehl/ghc,siddhanathan/ghc,tjakway/ghcjvm,snoyberg/ghc,GaloisInc/halvm-ghc,sdiehl/ghc,sgillespie/ghc,acowley/ghc,vikraman/ghc,AlexanderPankiv/ghc,nathyong/microghc-ghc,green-haskell/ghc,vTurbine/ghc,nushio3/ghc,tjakway/ghcjvm,mettekou/ghc,oldmanmike/ghc,AlexanderPankiv/ghc,spacekitteh/smcghc,da-x/ghc,fmthoma/ghc,forked-upstream-packages-for-ghcjs/ghc,ghc-android/ghc,vikraman/ghc,nushio3/ghc,acowley/ghc,siddhanathan/ghc,mfine/ghc,vTurbine/ghc,vTurbine/ghc,ghc-android/ghc,mfine/ghc,snoyberg/ghc,acowley/ghc,frantisekfarka/ghc-dsi,snoyberg/ghc,snoyberg/ghc,oldmanmike/ghc,forked-upstream-packages-for-ghcjs/ghc,fmthoma/ghc,nushio3/ghc,nkaretnikov/ghc,elieux/ghc,ml9951/ghc,bitemyapp/ghc,nkaretnikov/ghc,forked-upstream-packages-for-ghcjs/ghc,mfine/ghc,elieux/ghc,ezyang/ghc,AlexanderPankiv/ghc,acowley/ghc,christiaanb/ghc,olsner/ghc,ezyang/ghc,gridaphobe/ghc,anton-dessiatov/ghc,fmthoma/ghc,holzensp/ghc,acowley/ghc,christiaanb/ghc,olsner/ghc,snoyberg/ghc,ezyang/ghc,jstolarek/ghc,GaloisInc/halvm-ghc,AlexanderPankiv/ghc,tjakway/ghcjvm,christiaanb/ghc,wxwxwwxxx/ghc,sgillespie/ghc,urbanslug/ghc,ezyang/ghc,mfine/ghc,vikraman/ghc,ezyang/ghc,mettekou/ghc,mcschroeder/ghc,TomMD/ghc,forked-upstream-packages-for-ghcjs/ghc,ezyang/ghc,spacekitteh/smcghc,vTurbine/ghc,gridaphobe/ghc,sgillespie/ghc,shlevy/ghc,shlevy/ghc,green-haskell/ghc,ml9951/ghc,vTurbine/ghc,green-haskell/ghc,forked-upstream-packages-for-ghcjs/ghc,GaloisInc/halvm-ghc,lukexi/ghc,da-x/ghc,gridaphobe/ghc,lukexi/ghc,spacekitteh/smcghc,mettekou/ghc,TomMD/ghc,mfine/ghc,ghc-android/ghc,TomMD/ghc,fmthoma/ghc,gcampax/ghc,ml9951/ghc,acowley/ghc,bitemyapp/ghc,forked-upstream-packages-for-ghcjs/ghc,urbanslug/ghc,olsner/ghc,elieux/ghc,siddhanathan/ghc,anton-dessiatov/ghc,holzensp/ghc,vikraman/ghc,nushio3/ghc,christiaanb/ghc,vikraman/ghc,frantisekfarka/ghc-dsi,anton-dessiatov/ghc,olsner/ghc,jstolarek/ghc,da-x/ghc,oldmanmike/ghc,tjakway/ghcjvm,GaloisInc/halvm-ghc,holzensp/ghc,nathyong/microghc-ghc,vTurbine/ghc,TomMD/ghc,urbanslug/ghc,mcschroeder/ghc,vTurbine/ghc,shlevy/ghc,fmthoma/ghc,jstolarek/ghc,gcampax/ghc,jstolarek/ghc,mfine/ghc,mcschroeder/ghc,mettekou/ghc,vikraman/ghc,gridaphobe/ghc,lukexi/ghc,spacekitteh/smcghc,siddhanathan/ghc,jstolarek/ghc,TomMD/ghc,sgillespie/ghc,gcampax/ghc,urbanslug/ghc,green-haskell/ghc,AlexanderPankiv/ghc,bitemyapp/ghc,ml9951/ghc,mcschroeder/ghc,da-x/ghc,mettekou/ghc,olsner/ghc,elieux/ghc,anton-dessiatov/ghc,shlevy/ghc,da-x/ghc,ml9951/ghc,ml9951/ghc,frantisekfarka/ghc-dsi,gcampax/ghc,nkaretnikov/ghc,christiaanb/ghc,gridaphobe/ghc,sgillespie/ghc,oldmanmike/ghc,siddhanathan/ghc,nathyong/microghc-ghc,sgillespie/ghc,mettekou/ghc,wxwxwwxxx/ghc,GaloisInc/halvm-ghc,mfine/ghc,gcampax/ghc,nkaretnikov/ghc,nushio3/ghc,sdiehl/ghc,oldmanmike/ghc,shlevy/ghc,nathyong/microghc-ghc,tjakway/ghcjvm,siddhanathan/ghc,fmthoma/ghc,GaloisInc/halvm-ghc,mcschroeder/ghc,nushio3/ghc,oldmanmike/ghc,siddhanathan/ghc,olsner/ghc,fmthoma/ghc,sdiehl/ghc,AlexanderPankiv/ghc,green-haskell/ghc,spacekitteh/smcghc,gridaphobe/ghc,shlevy/ghc,gridaphobe/ghc,anton-dessiatov/ghc,da-x/ghc,TomMD/ghc,wxwxwwxxx/ghc,forked-upstream-packages-for-ghcjs/ghc,snoyberg/ghc,lukexi/ghc,christiaanb/ghc,anton-dessiatov/ghc,GaloisInc/halvm-ghc,gcampax/ghc,ghc-android/ghc,sdiehl/ghc,nathyong/microghc-ghc,tjakway/ghcjvm,elieux/ghc,nathyong/microghc-ghc,wxwxwwxxx/ghc,mettekou/ghc,shlevy/ghc,gcampax/ghc,wxwxwwxxx/ghc,nushio3/ghc,ghc-android/ghc,wxwxwwxxx/ghc,TomMD/ghc,oldmanmike/ghc,frantisekfarka/ghc-dsi,urbanslug/ghc,elieux/ghc,lukexi/ghc,mcschroeder/ghc,ml9951/ghc,anton-dessiatov/ghc,nkaretnikov/ghc,tjakway/ghcjvm,vikraman/ghc,nkaretnikov/ghc,mcschroeder/ghc,da-x/ghc,bitemyapp/ghc,frantisekfarka/ghc-dsi,holzensp/ghc