message: Update tf.reduce_max and tf.reduce_min
diff: @@ -1519,7 +1519,7 @@ def reduce_min(input_tensor,
  entry in `axis`. If `keepdims` is true, the reduced dimensions
  are retained with length 1.
  - If `axis` has no entries, all dimensions are reduced, and a
  + If `axis` is None, all dimensions are reduced, and a
  tensor with a single element is returned.
  Args:
  @@ -1568,7 +1568,7 @@ def reduce_max(input_tensor,
  entry in `axis`. If `keepdims` is true, the reduced dimensions
  are retained with length 1.
  - If `axis` has no entries, all dimensions are reduced, and a
  + If `axis` is None, all dimensions are reduced, and a
  tensor with a single element is returned.
  Args:
  