code: func NewCmdNode() *cobra.Command {
  	cmd := &cobra.Command{
  		Use:   "node",
  		Short: "Upgrade commands for a node in the cluster. Currently only support upgrading the configuration, not the kubelet itself",
  		RunE:  cmdutil.SubCmdRunE("node"),
  	}
  	cmd.AddCommand(NewCmdUpgradeNodeConfig())
  	cmd.AddCommand(NewCmdUpgradeControlPlane())
  	return cmd
  }
docs: // NewCmdNode returns the cobra command for `kubeadm upgrade node`