clarify CloseSend vs CloseAndRecv; better formatting (#2071)
clarify CloseSend vs CloseAndRecv; better formatting (#2071)

clarify CloseSend vs CloseAndRecv; better formatting

improbable-io/grpc-go,dfawley/grpc-go,menghanl/grpc-go,dfawley/grpc-go,stanley-cheung/grpc-go,thinkerou/grpc-go,MakMukhi/grpc-go,grpc/grpc-go,grpc/grpc-go,improbable-io/grpc-go,menghanl/grpc-go,MakMukhi/grpc-go,thinkerou/grpc-go,stanley-cheung/grpc-go