code: func NewRoundRobinPeerGroupResolver(sigPolicyEnv *common.SignaturePolicyEnvelope) (PeerGroupResolver, error) {
  	groupRetriever, err := CompileSignaturePolicy(sigPolicyEnv)
  	if err != nil {
  		return nil, errors.WithMessage(err, "error evaluating signature policy")
  	}
  	return NewPeerGroupResolver(groupRetriever, NewRoundRobinLBP())
  }
docs: // NewRoundRobinPeerGroupResolver returns a PeerGroupResolver that chooses peers in a round-robin fashion