docs: func (s *AttachmentStateChange) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "AttachmentStateChange"}
  	if s.AttachmentArn == nil {
  		invalidParams.Add(request.NewErrParamRequired("AttachmentArn"))
  	}
  	if s.Status == nil {
  		invalidParams.Add(request.NewErrParamRequired("Status"))
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }