message: Fix comment in xla_data.proto related to padding value for Windows.
diff: @@ -355,17 +355,19 @@ message WindowDimension {
  // positions of the window in this dimension.
  int64 stride = 2;
  - // If positive, means the amount of padding with zeroes to add to the base
  - // area at the low end of this dimension; if negative, its negative means the
  - // number of elements removed from the low end of this dimension. For example,
  - // in the horizontal dimension of a rectangle, this would be the number of
  - // zeroes to pad on the left, given that indices increase when going right.
  + // If positive, means the amount of padding to add to the base area at the low
  + // end of this dimension; if negative, its negative means the number of
  + // elements removed from the low end of this dimension. For example, in the
  + // horizontal dimension of a rectangle, this would be the number of padding
  + // values to pad on the left, given that indices increase when going right.
  + // The actual padding value depends upon the context. Convolution pads with
  + // zeros. ReduceWindow and SelectAndScatter pads with the reduce function's
  + // init value.
  int64 padding_low = 3;
  - // As padding_low, but on the high end of this dimension. For
  - // example, in the horizontal dimension of a rectangle, this would
  - // be the number of zeroes to pad on the right, given that indices
  - // increase when going right.
  + // As padding_low, but on the high end of this dimension. For example, in the
  + // horizontal dimension of a rectangle, this would be the number of values to
  + // pad on the right, given that indices increase when going right.
  int64 padding_high = 4;
  // Dilation factor of the sliding window in this dimension. A dilation factor
  