code: public void buildErrorSummary(XMLNode node, Content summaryContentTree) {
          String errorTableSummary =
                  configuration.getText("doclet.Member_Table_Summary",
                  configuration.getText("doclet.Error_Summary"),
                  configuration.getText("doclet.errors"));
          List<String> errorTableHeader = Arrays.asList(configuration.getText("doclet.Error"),
                  configuration.getText("doclet.Description"));
          Set<TypeElement> ierrors =
              utils.isSpecified(packageElement)
                  ? utils.getTypeElementsAsSortedSet(utils.getErrors(packageElement))
                  : configuration.typeElementCatalog.errors(packageElement);
          SortedSet<TypeElement> errors = utils.filterOutPrivateClasses(ierrors, configuration.javafx);
          if (!errors.isEmpty()) {
              packageWriter.addClassesSummary(errors,
                      configuration.getText("doclet.Error_Summary"),
                      errorTableSummary, errorTableHeader, summaryContentTree);
          }
      }
docs: Build the summary for the errors in this package.
  
  @param node the XML element that specifies which components to document
  @param summaryContentTree the summary tree to which the error summary will
  be added