message: Fix broken doc links to tf.math.unsorted_segment_sum operator.
diff: @@ -4000,8 +4000,7 @@ def unsorted_segment_mean(data, segment_ids, num_segments, name=None):
  segmentation](https://www.tensorflow.org/versions/r2.0/api_docs/python/tf/math#about_segmentation)
  for an explanation of segments.
  - This operator is similar to the unsorted segment sum operator found
  - [here](../../../api_docs/python/math_ops.md#UnsortedSegmentSum).
  + This operator is similar to the `tf.math.unsorted_segment_sum` operator.
  Instead of computing the sum over segments, it computes the mean of all
  entries belonging to a segment such that:
  @@ -4047,8 +4046,7 @@ def unsorted_segment_sqrt_n(data, segment_ids, num_segments, name=None):
  segmentation](https://www.tensorflow.org/versions/r2.0/api_docs/python/tf/math#about_segmentation)
  for an explanation of segments.
  - This operator is similar to the unsorted segment sum operator found
  - [here](../../../api_docs/python/math_ops.md#UnsortedSegmentSum).
  + This operator is similar to the `tf.math.unsorted_segment_sum` operator.
  Additionally to computing the sum over segments, it divides the results by
  sqrt(N).
  