Added method signature to docs
Added method signature to docs

ChetanGandhi/LinqToObjectiveC,ColinEberhardt/LinqToObjectiveC,suxinde2009/LinqToObjectiveC,ShengQiangLiu/LinqToObjectiveC,yunleihao/LinqToObjectiveC,suxinde2009/LinqToObjectiveC,ShengQiangLiu/LinqToObjectiveC,yunleihao/LinqToObjectiveC