docs: func (s *UpdateVTLDeviceTypeInput) Validate() error {
  	invalidParams := request.ErrInvalidParams{Context: "UpdateVTLDeviceTypeInput"}
  	if s.DeviceType == nil {
  		invalidParams.Add(request.NewErrParamRequired("DeviceType"))
  	}
  	if s.DeviceType != nil && len(*s.DeviceType) < 2 {
  		invalidParams.Add(request.NewErrParamMinLen("DeviceType", 2))
  	}
  	if s.VTLDeviceARN == nil {
  		invalidParams.Add(request.NewErrParamRequired("VTLDeviceARN"))
  	}
  	if s.VTLDeviceARN != nil && len(*s.VTLDeviceARN) < 50 {
  		invalidParams.Add(request.NewErrParamMinLen("VTLDeviceARN", 50))
  	}
  
  	if invalidParams.Len() > 0 {
  		return invalidParams
  	}
  	return nil
  }