docs: func (s *DescribeReservationInput) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "DescribeReservationInput"}
  	if s.ReservationId == nil {
  		invalidParams.Add(request.NewErrParamRequired("ReservationId"))
  	}
  	if s.ReservationId != nil && len(*s.ReservationId) < 1 {
  		invalidParams.Add(request.NewErrParamMinLen("ReservationId", 1))
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }