code: func GetJoinControlPlaneCommand(kubeConfigFile, token, key string, skipTokenPrint, skipCertificateKeyPrint bool) (string, error) {
  	return getJoinCommand(kubeConfigFile, token, key, true, skipTokenPrint, skipCertificateKeyPrint)
  }
docs: // GetJoinControlPlaneCommand returns the kubeadm join command for a given token and
  // and Kubernetes cluster (the current cluster in the kubeconfig file)