docs: func (s *UpdateSnapshotScheduleInput) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "UpdateSnapshotScheduleInput"}
  	if s.Description != nil && len(*s.Description) < 1 {
  		invalidParams.Add(request.NewErrParamMinLen("Description", 1))
  	}
  	if s.RecurrenceInHours == nil {
  		invalidParams.Add(request.NewErrParamRequired("RecurrenceInHours"))
  	}
  	if s.RecurrenceInHours != nil && *s.RecurrenceInHours < 1 {
  		invalidParams.Add(request.NewErrParamMinValue("RecurrenceInHours", 1))
  	}
  	if s.StartAt == nil {
  		invalidParams.Add(request.NewErrParamRequired("StartAt"))
  	}
  	if s.VolumeARN == nil {
  		invalidParams.Add(request.NewErrParamRequired("VolumeARN"))
  	}
  	if s.VolumeARN != nil && len(*s.VolumeARN) < 50 {
  		invalidParams.Add(request.NewErrParamMinLen("VolumeARN", 50))
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }