code: public static void generate(ConfigurationImpl configuration) throws DocFileIOException {
          DocPath filename = DocPaths.OVERVIEW_FRAME;
          PackageIndexFrameWriter packgen = new PackageIndexFrameWriter(configuration, filename);
          packgen.buildPackageIndexFile("doclet.Window_Overview", false);
      }
docs: Generate the package index file named "overview-frame.html".
  @throws DocFileIOException