code: public BoxRequestsBookmark.UpdateBookmark getDisableSharedLinkRequest(String id) {
          BoxRequestsBookmark.UpdateBookmark request = new BoxRequestsBookmark.UpdateBookmark(id, getBookmarkInfoUrl(id), mSession)
                  .setSharedLink(null);
          return request;
      }
docs: Gets a request that disables a shared link for a bookmark
  
  @param id        id of bookmark to disable a shared link for
  @return      request to create a shared link for a bookmark