code: public Content getContentsList(Content contentListTree) {
          Content titleContent = getResource(
                  "doclet.Constants_Summary");
          Content pHeading = HtmlTree.HEADING(HtmlConstants.TITLE_HEADING, true,
                  HtmlStyle.title, titleContent);
          Content div = HtmlTree.DIV(HtmlStyle.header, pHeading);
          Content headingContent = getResource(
                  "doclet.Contents");
          div.addContent(HtmlTree.HEADING(HtmlConstants.CONTENT_HEADING, true,
                  headingContent));
          div.addContent(contentListTree);
          return div;
      }
docs: {@inheritDoc}