Fix grammar mistakes.
Fix grammar mistakes.

oisindoherty/RiotSharp,jono-90/RiotSharp,Challengermode/RiotSharp,Oucema90/RiotSharp,BenFradet/RiotSharp,florinciubotariu/RiotSharp,frederickrogan/RiotSharp,aktai0/RiotSharp,JanOuborny/RiotSharp,Shidesu/RiotSharp