code: @Override
      public UpdateGatewayGroupResult updateGatewayGroup(UpdateGatewayGroupRequest request) {
          request = beforeClientExecution(request);
          return executeUpdateGatewayGroup(request);
      }
docs: <p>
  Updates the details of a gateway group. If any optional field is not provided, the existing corresponding value
  is left unmodified.
  </p>
  
  @param updateGatewayGroupRequest
  @return Result of the UpdateGatewayGroup operation returned by the service.
  @throws NotFoundException
  The resource is not found.
  @throws NameInUseException
  The name sent in the request is already in use.
  @sample AmazonAlexaForBusiness.UpdateGatewayGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/alexaforbusiness-2017-11-09/UpdateGatewayGroup"
  target="_top">AWS API Documentation</a>