code: protected void addOverviewComment(Content htmltree) {
          if (root.inlineTags().length > 0) {
              htmltree.addContent(
                      getMarkerAnchor(SectionName.OVERVIEW_DESCRIPTION));
              addInlineComment(root, htmltree);
          }
      }
docs: Adds the overview comment as provided in the file specified by the
  "-overview" option on the command line.
  
  @param htmltree the documentation tree to which the overview comment will
  be added