code: @Override
      public ListDocumentsResult listDocuments(ListDocumentsRequest request) {
          request = beforeClientExecution(request);
          return executeListDocuments(request);
      }
docs: <p>
  Describes one or more of your Systems Manager documents.
  </p>
  
  @param listDocumentsRequest
  @return Result of the ListDocuments operation returned by the service.
  @throws InternalServerErrorException
  An error occurred on the server side.
  @throws InvalidNextTokenException
  The specified token is not valid.
  @throws InvalidFilterKeyException
  The specified key is not valid.
  @sample AWSSimpleSystemsManagement.ListDocuments
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ssm-2014-11-06/ListDocuments" target="_top">AWS API
  Documentation</a>