code: public BoxRequestsBookmark.UpdateBookmark getRenameRequest(String id, String newName) {
          BoxRequestsBookmark.UpdateBookmark request = new BoxRequestsBookmark.UpdateBookmark(id, getBookmarkInfoUrl(id), mSession);
          request.setName(newName);
          return request;
      }
docs: Gets a request that renames a bookmark
  
  @param id        id of bookmark to rename
  @param newName   id of bookmark to retrieve info on
  @return      request to rename a bookmark