code: public void addSummaryHeader(AbstractMemberWriter mw, TypeElement typeElement,
              Content memberTree) {
          mw.addSummaryAnchor(typeElement, memberTree);
          mw.addSummaryLabel(memberTree);
      }
docs: Add the summary header.
  
  @param mw the writer for the member being documented
  @param typeElement the te to be documented
  @param memberTree the content tree to which the summary header will be added