code: func (bto *BootstrapTokenOptions) AddUsagesFlag(fs *pflag.FlagSet) {
  	fs.StringSliceVar(
  		&bto.Usages, TokenUsages, bto.Usages,
  		fmt.Sprintf("Describes the ways in which this token can be used. You can pass --usages multiple times or provide a comma separated list of options. Valid options: [%s]", strings.Join(kubeadmconstants.DefaultTokenUsages, ",")),
  	)
  }
docs: // AddUsagesFlag adds the --usages flag to the given flagset