code: func (i UpdateWAFConfigSetInput) validate() error {
  	if i.ConfigSetID == "" {
  		return ErrMissingConfigSetID
  	}
  
  	if len(i.WAFList) == 0 {
  		return ErrMissingWAFList
  	}
  
  	return nil
  }
docs: // validate makes sure the UpdateWAFConfigSetInput instance has all
  // fields we need to assign the config set to the WAF(s)