Remove references to GHC 6.6 in docs
Remove references to GHC 6.6 in docs

ezyang/ghc,nushio3/ghc,bitemyapp/ghc,ezyang/ghc,forked-upstream-packages-for-ghcjs/ghc,siddhanathan/ghc,mfine/ghc,holzensp/ghc,oldmanmike/ghc,urbanslug/ghc,spacekitteh/smcghc,TomMD/ghc,gcampax/ghc,mcschroeder/ghc,urbanslug/ghc,nushio3/ghc,sdiehl/ghc,acowley/ghc,ghc-android/ghc,ryantm/ghc,olsner/ghc,anton-dessiatov/ghc,vTurbine/ghc,hferreiro/replay,tibbe/ghc,holzensp/ghc,ekmett/ghc,shlevy/ghc,mcschroeder/ghc,frantisekfarka/ghc-dsi,elieux/ghc,GaloisInc/halvm-ghc,da-x/ghc,fmthoma/ghc,shlevy/ghc,mfine/ghc,ml9951/ghc,nathyong/microghc-ghc,ezyang/ghc,wxwxwwxxx/ghc,ryantm/ghc,AlexanderPankiv/ghc,ekmett/ghc,AlexanderPankiv/ghc,GaloisInc/halvm-ghc,acowley/ghc,urbanslug/ghc,anton-dessiatov/ghc,fmthoma/ghc,olsner/ghc,green-haskell/ghc,vikraman/ghc,elieux/ghc,frantisekfarka/ghc-dsi,ezyang/ghc,mcschroeder/ghc,christiaanb/ghc,oldmanmike/ghc,christiaanb/ghc,vikraman/ghc,nushio3/ghc,TomMD/ghc,da-x/ghc,lukexi/ghc,lukexi/ghc,gridaphobe/ghc,lukexi/ghc,hferreiro/replay,sgillespie/ghc,siddhanathan/ghc,christiaanb/ghc,lukexi/ghc-7.8-arm64,forked-upstream-packages-for-ghcjs/ghc,sdiehl/ghc,sgillespie/ghc,GaloisInc/halvm-ghc,bitemyapp/ghc,ghc-android/ghc,mcschroeder/ghc,anton-dessiatov/ghc,olsner/ghc,anton-dessiatov/ghc,gridaphobe/ghc,ezyang/ghc,siddhanathan/ghc,green-haskell/ghc,hferreiro/replay,gcampax/ghc,snoyberg/ghc,hferreiro/replay,nkaretnikov/ghc,elieux/ghc,shlevy/ghc,snoyberg/ghc,mfine/ghc,siddhanathan/ghc,acowley/ghc,nushio3/ghc,forked-upstream-packages-for-ghcjs/ghc,AlexanderPankiv/ghc,da-x/ghc,olsner/ghc,ekmett/ghc,tjakway/ghcjvm,gcampax/ghc,da-x/ghc,elieux/ghc,nathyong/microghc-ghc,AlexanderPankiv/ghc,da-x/ghc,elieux/ghc,lukexi/ghc,shlevy/ghc,nathyong/microghc-ghc,ryantm/ghc,TomMD/ghc,snoyberg/ghc,gcampax/ghc,mettekou/ghc,vikraman/ghc,jstolarek/ghc,elieux/ghc,shlevy/ghc,wxwxwwxxx/ghc,ezyang/ghc,vTurbine/ghc,shlevy/ghc,nathyong/microghc-ghc,hferreiro/replay,nkaretnikov/ghc,tjakway/ghcjvm,shlevy/ghc,oldmanmike/ghc,nushio3/ghc,tibbe/ghc,ghc-android/ghc,vikraman/ghc,mettekou/ghc,sdiehl/ghc,jstolarek/ghc,da-x/ghc,bitemyapp/ghc,oldmanmike/ghc,GaloisInc/halvm-ghc,forked-upstream-packages-for-ghcjs/ghc,gridaphobe/ghc,ryantm/ghc,mettekou/ghc,bitemyapp/ghc,christiaanb/ghc,snoyberg/ghc,frantisekfarka/ghc-dsi,anton-dessiatov/ghc,sdiehl/ghc,olsner/ghc,frantisekfarka/ghc-dsi,jstolarek/ghc,mcschroeder/ghc,tjakway/ghcjvm,sgillespie/ghc,urbanslug/ghc,gcampax/ghc,GaloisInc/halvm-ghc,mettekou/ghc,siddhanathan/ghc,fmthoma/ghc,gridaphobe/ghc,TomMD/ghc,ghc-android/ghc,gcampax/ghc,siddhanathan/ghc,holzensp/ghc,spacekitteh/smcghc,TomMD/ghc,vTurbine/ghc,nathyong/microghc-ghc,nushio3/ghc,ml9951/ghc,sdiehl/ghc,sgillespie/ghc,gridaphobe/ghc,lukexi/ghc-7.8-arm64,ekmett/ghc,gcampax/ghc,sgillespie/ghc,sdiehl/ghc,vikraman/ghc,mettekou/ghc,green-haskell/ghc,GaloisInc/halvm-ghc,wxwxwwxxx/ghc,anton-dessiatov/ghc,nkaretnikov/ghc,tibbe/ghc,acowley/ghc,acowley/ghc,ml9951/ghc,hferreiro/replay,tibbe/ghc,christiaanb/ghc,ryantm/ghc,nkaretnikov/ghc,siddhanathan/ghc,snoyberg/ghc,christiaanb/ghc,nushio3/ghc,nathyong/microghc-ghc,oldmanmike/ghc,jstolarek/ghc,spacekitteh/smcghc,AlexanderPankiv/ghc,sgillespie/ghc,green-haskell/ghc,ml9951/ghc,tjakway/ghcjvm,tjakway/ghcjvm,vTurbine/ghc,forked-upstream-packages-for-ghcjs/ghc,fmthoma/ghc,elieux/ghc,olsner/ghc,hferreiro/replay,green-haskell/ghc,vTurbine/ghc,TomMD/ghc,gridaphobe/ghc,bitemyapp/ghc,AlexanderPankiv/ghc,vTurbine/ghc,nkaretnikov/ghc,jstolarek/ghc,christiaanb/ghc,vTurbine/ghc,lukexi/ghc-7.8-arm64,mcschroeder/ghc,spacekitteh/smcghc,oldmanmike/ghc,ghc-android/ghc,holzensp/ghc,sdiehl/ghc,gridaphobe/ghc,urbanslug/ghc,fmthoma/ghc,mcschroeder/ghc,acowley/ghc,da-x/ghc,lukexi/ghc,forked-upstream-packages-for-ghcjs/ghc,spacekitteh/smcghc,wxwxwwxxx/ghc,ml9951/ghc,ml9951/ghc,nkaretnikov/ghc,tibbe/ghc,forked-upstream-packages-for-ghcjs/ghc,mettekou/ghc,mfine/ghc,wxwxwwxxx/ghc,tjakway/ghcjvm,ekmett/ghc,urbanslug/ghc,snoyberg/ghc,GaloisInc/halvm-ghc,nathyong/microghc-ghc,sgillespie/ghc,mfine/ghc,tjakway/ghcjvm,wxwxwwxxx/ghc,oldmanmike/ghc,wxwxwwxxx/ghc,holzensp/ghc,nkaretnikov/ghc,fmthoma/ghc,fmthoma/ghc,snoyberg/ghc,anton-dessiatov/ghc,mfine/ghc,urbanslug/ghc,acowley/ghc,ghc-android/ghc,olsner/ghc,frantisekfarka/ghc-dsi,mettekou/ghc,ml9951/ghc,lukexi/ghc-7.8-arm64,lukexi/ghc-7.8-arm64,vikraman/ghc,AlexanderPankiv/ghc,vikraman/ghc,mfine/ghc,ghc-android/ghc,ezyang/ghc,TomMD/ghc,ml9951/ghc