message: Update map_and_batch_dataset_op.cc
diff: @@ -353,7 +353,7 @@ class MapAndBatchDatasetOp : public UnaryDatasetOpKernel {
  }
  private:
  - // BatchResult encapsulates the output batch, as well as anciliary
  + // BatchResult encapsulates the output batch, as well as ancillary
  // metadata required to execute the fused map-and-batch operation.
  struct BatchResult {
  explicit BatchResult(int64 batch_size) {
  