Fix syntax in some code in the user guide; fixes #8007
Fix syntax in some code in the user guide; fixes #8007

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