code: func NewServergRPC(addr string, group []*Config) (*ServergRPC, error) {
  
  	s, err := NewServer(addr, group)
  	if err != nil {
  		return nil, err
  	}
  	gs := &ServergRPC{Server: s}
  	return gs, nil
  }
docs: // NewServergRPC returns a new CoreDNS GRPC server and compiles all plugin in to it.