code: @Override
      protected void addOverviewHeader(Content body) {
          addConfigurationTitle(body);
          if (!utils.getFullBody(configuration.overviewElement).isEmpty()) {
              HtmlTree div = new HtmlTree(HtmlTag.DIV);
              div.addStyle(HtmlStyle.contentContainer);
              addOverviewComment(div);
              if (configuration.allowTag(HtmlTag.MAIN)) {
                  htmlTree.addContent(div);
              } else {
                  body.addContent(div);
              }
          }
      }
docs: Adds the overview summary comment for this documentation. Add one line
  summary at the top of the page and generate a link to the description,
  which is added at the end of this page.
  
  @param body the documentation tree to which the overview header will be added