document special "this" syntax for PackageImports (#7409)
document special "this" syntax for PackageImports (#7409)

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