Fix a couple of typos in ST docs
Fix a couple of typos in ST docs

markuspf/Idris-dev,Heather/Idris-dev,uuhan/Idris-dev,FranklinChen/Idris-dev,kojiromike/Idris-dev,mpkh/Idris-dev,uuhan/Idris-dev,uuhan/Idris-dev,mpkh/Idris-dev,mpkh/Idris-dev,kojiromike/Idris-dev,Heather/Idris-dev,markuspf/Idris-dev,mpkh/Idris-dev,kojiromike/Idris-dev,uuhan/Idris-dev,Heather/Idris-dev,FranklinChen/Idris-dev,mpkh/Idris-dev,markuspf/Idris-dev,Heather/Idris-dev,FranklinChen/Idris-dev,Heather/Idris-dev,markuspf/Idris-dev,FranklinChen/Idris-dev,kojiromike/Idris-dev,Heather/Idris-dev,uuhan/Idris-dev,kojiromike/Idris-dev,kojiromike/Idris-dev,markuspf/Idris-dev,markuspf/Idris-dev,uuhan/Idris-dev,FranklinChen/Idris-dev,FranklinChen/Idris-dev,mpkh/Idris-dev,uuhan/Idris-dev,markuspf/Idris-dev