code: @Override
      public DescribeCommentsResult describeComments(DescribeCommentsRequest request) {
          request = beforeClientExecution(request);
          return executeDescribeComments(request);
      }
docs: <p>
  List all the comments for the specified document version.
  </p>
  
  @param describeCommentsRequest
  @return Result of the DescribeComments operation returned by the service.
  @throws EntityNotExistsException
  The resource does not exist.
  @throws ProhibitedStateException
  The specified document version is not in the INITIALIZED state.
  @throws UnauthorizedOperationException
  The operation is not permitted.
  @throws UnauthorizedResourceAccessException
  The caller does not have access to perform the action on the resource.
  @throws FailedDependencyException
  The AWS Directory Service cannot reach an on-premises instance. Or a dependency under the control of the
  organization is failing, such as a connected Active Directory.
  @throws ServiceUnavailableException
  One or more of the dependencies is unavailable.
  @sample AmazonWorkDocs.DescribeComments
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/workdocs-2016-05-01/DescribeComments" target="_top">AWS API
  Documentation</a>