Typo in docs
Typo in docs

Spelling mistakes fixed,

 * identiy > identity
 * suprising > surprising

Reviewers: austin, bgamari

Reviewed By: bgamari

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D1871

sdiehl/ghc,ezyang/ghc,mettekou/ghc,olsner/ghc,shlevy/ghc,sdiehl/ghc,sdiehl/ghc,mcschroeder/ghc,sdiehl/ghc,mettekou/ghc,sgillespie/ghc,mcschroeder/ghc,sgillespie/ghc,nushio3/ghc,vikraman/ghc,olsner/ghc,vikraman/ghc,nushio3/ghc,oldmanmike/ghc,shlevy/ghc,mcschroeder/ghc,ezyang/ghc,vTurbine/ghc,shlevy/ghc,sgillespie/ghc,shlevy/ghc,vTurbine/ghc,mettekou/ghc,snoyberg/ghc,olsner/ghc,nushio3/ghc,snoyberg/ghc,olsner/ghc,oldmanmike/ghc,mcschroeder/ghc,tjakway/ghcjvm,snoyberg/ghc,ezyang/ghc,snoyberg/ghc,oldmanmike/ghc,sgillespie/ghc,shlevy/ghc,mettekou/ghc,vTurbine/ghc,vikraman/ghc,vTurbine/ghc,vTurbine/ghc,sdiehl/ghc,snoyberg/ghc,ezyang/ghc,vTurbine/ghc,sdiehl/ghc,oldmanmike/ghc,mettekou/ghc,olsner/ghc,tjakway/ghcjvm,vikraman/ghc,shlevy/ghc,nushio3/ghc,vikraman/ghc,sdiehl/ghc,mettekou/ghc,vikraman/ghc,shlevy/ghc,tjakway/ghcjvm,sgillespie/ghc,nushio3/ghc,tjakway/ghcjvm,nushio3/ghc,vikraman/ghc,olsner/ghc,ezyang/ghc,tjakway/ghcjvm,mcschroeder/ghc,oldmanmike/ghc,ezyang/ghc,mcschroeder/ghc,oldmanmike/ghc,nushio3/ghc,snoyberg/ghc,olsner/ghc,tjakway/ghcjvm,mcschroeder/ghc,sgillespie/ghc,oldmanmike/ghc,sgillespie/ghc,mettekou/ghc,ezyang/ghc,vTurbine/ghc,snoyberg/ghc,tjakway/ghcjvm