code: func WarnWordSepNormalizeFunc(f *pflag.FlagSet, name string) pflag.NormalizedName {
  	if strings.Contains(name, "_") {
  		nname := strings.Replace(name, "_", "-", -1)
  		glog.Warningf("%s is DEPRECATED and will be removed in a future version. Use %s instead.", name, nname)
  
  		return pflag.NormalizedName(nname)
  	}
  	return pflag.NormalizedName(name)
  }
docs: // WarnWordSepNormalizeFunc changes and warns for flags that contain "_" separators