docs: function (pageConfig, contentId) {
              var outputContent = [];
              var content = pageConfig.contents.placeholderContents
                      ? pageConfig.contents.placeholderContents[contentId]
                      : null;
              if (!content) {
                  return outputContent;
              }
              if (!ariaUtilsType.isArray(content)) {
                  content = [content];
              }
              for (var i = 0, length = content.length; i < length; i++) {
                  outputContent = outputContent.concat(this.processContent(content[i]));
              }
              return outputContent;
          }