code: protected void addTopicContentsToLevelDocument(final DocBookVersion docBookVersion, final Level level, final SpecTopic specTopic,
              final Element parentNode, final Document doc) {
          addTopicContentsToLevelDocument(docBookVersion, level, specTopic, parentNode, doc, true);
      }
docs: Adds a Topics contents as the introduction text for a Level.
  
  @param docBookVersion
  @param level          The level the intro topic is being added for.
  @param specTopic      The Topic that contains the introduction content.
  @param parentNode     The DOM parent node the intro content is to be appended to.
  @param doc            The DOM Document the content is to be added to.