code: public Content getMarkerAnchor(SectionName sectionName, String anchorName) {
          return getMarkerAnchor(sectionName.getName() + getName(anchorName), null);
      }
docs: Get the marker anchor which will be added to the documentation tree.
  
  @param sectionName the section name anchor attribute for page
  @param anchorName the anchor name combined with section name attribute for the page
  @return a content tree for the marker anchor