code: @Override
      public DescribeVpcEndpointServicesResult describeVpcEndpointServices(DescribeVpcEndpointServicesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeVpcEndpointServices(request);
      }
docs: <p>
  Describes available services to which you can create a VPC endpoint.
  </p>
  
  @param describeVpcEndpointServicesRequest
  Contains the parameters for DescribeVpcEndpointServices.
  @return Result of the DescribeVpcEndpointServices operation returned by the service.
  @sample AmazonEC2.DescribeVpcEndpointServices
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ec2-2016-11-15/DescribeVpcEndpointServices"
  target="_top">AWS API Documentation</a>