Typo fix in deferred type errors docs.
Typo fix in deferred type errors docs.

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

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