code: public BoxRequestsFile.DeleteFileFromCollection getDeleteFromCollectionRequest(String id) {
          BoxRequestsFile.DeleteFileFromCollection request = new BoxRequestsFile.DeleteFileFromCollection(id, getFileInfoUrl(id), mSession);
          return request;
      }
docs: Gets a request that removes a file from a collection
  
  @param id        id of file to delete from the collection
  @return request to delete a file from a collection