code: func configsApplyReleaseDesc(opts SetOpts) string {
  	vars := opts.Vars
  	verb := "Set"
  	plural := ""
  	if len(vars) > 1 {
  		plural = "s"
  	}
  
  	keys := make(sort.StringSlice, 0, len(vars))
  	for k, v := range vars {
  		keys = append(keys, string(k))
  		if v == nil {
  			verb = "Unset"
  		}
  	}
  	keys.Sort()
  	desc := fmt.Sprintf("%s %s config var%s", verb, strings.Join(keys, ", "), plural)
  	return appendMessageToDescription(desc, opts.User, opts.Message)
  }
docs: // configsApplyReleaseDesc formats a release description based on the config variables
  // being applied.