message: Update the doc for NormalizeOp
diff: @@ -50,8 +50,8 @@ public class NormalizeOp implements TensorOperator {
  * happen, and original input will be directly returned in execution.
  *
  * <p>Note: The returned {@link TensorBuffer} is always a {@link DataType#FLOAT32} tensor at
  - * present, except that the input is a {@link DataType#UINT8} tensor, {@code mean} is set to 0 and
  - * {@code stddev} is set to 1.
  + * present, except when the input is a {@link DataType#UINT8} tensor, {@code mean} is set to 0 and
  + * {@code stddev} is set to 1, so that the original {@link DataType#UINT8} tensor is returned.
  *
  * @param mean the mean value to be subtracted first.
  * @param stddev the standard deviation value to divide then.
  