code: private void addAllPackagesFrameTag(Content contentTree) {
          HtmlTree frame = HtmlTree.FRAME(DocPaths.OVERVIEW_FRAME.getPath(),
                  "packageListFrame", configuration.getText("doclet.All_Packages"));
          contentTree.addContent(frame);
      }
docs: Add the FRAME tag for the frame that lists all packages.
  
  @param contentTree the content tree to which the information will be added