code: @Override
      public DescribeCertificatesResult describeCertificates(DescribeCertificatesRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeCertificates(request);
      }
docs: <p>
  Provides a description of the certificate.
  </p>
  
  @param describeCertificatesRequest
  @return Result of the DescribeCertificates operation returned by the service.
  @throws ResourceNotFoundException
  The resource could not be found.
  @sample AWSDatabaseMigrationService.DescribeCertificates
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/dms-2016-01-01/DescribeCertificates" target="_top">AWS API
  Documentation</a>