code: @Override
      public DeleteOptionGroupResult deleteOptionGroup(DeleteOptionGroupRequest request) {
          request = beforeClientExecution(request);
          return executeDeleteOptionGroup(request);
      }
docs: <p>
  Deletes an existing option group.
  </p>
  
  @param deleteOptionGroupRequest
  @return Result of the DeleteOptionGroup operation returned by the service.
  @throws OptionGroupNotFoundException
  The specified option group could not be found.
  @throws InvalidOptionGroupStateException
  The option group isn't in the <i>available</i> state.
  @sample AmazonRDS.DeleteOptionGroup
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/rds-2014-10-31/DeleteOptionGroup" target="_top">AWS API
  Documentation</a>