code: private void buildOperationTitle(MarkupDocBuilder markupDocBuilder, String title, String anchor) {
          if (config.getPathsGroupedBy() == GroupBy.AS_IS) {
              markupDocBuilder.sectionTitleWithAnchorLevel2(title, anchor);
          } else {
              markupDocBuilder.sectionTitleWithAnchorLevel3(title, anchor);
          }
      }
docs: Adds a operation title to the document.
  
  @param title  the operation title
  @param anchor optional anchor (null => auto-generate from title)