code: public Content getInheritedSummaryHeader(ClassDoc classDoc) {
          Content inheritedTree = writer.getMemberTreeHeader();
          writer.addInheritedSummaryHeader(this, classDoc, inheritedTree);
          return inheritedTree;
      }
docs: Get the inherited summary header for the given class.
  
  @param classDoc the class the inherited member belongs to
  @return a content tree for the inherited summary header