code: public BoxRequestsBookmark.UpdateBookmark getMoveRequest(String id, String parentId) {
          BoxRequestsBookmark.UpdateBookmark request = new BoxRequestsBookmark.UpdateBookmark(id, getBookmarkInfoUrl(id), mSession);
          request.setParentId(parentId);
          return request;
      }
docs: Gets a request that moves a bookmark to another folder
  
  @param id        id of bookmark to move
  @param parentId  id of parent folder to move bookmark into
  @return      request to move a bookmark