message: Fix doc discrepancy in tf.scatter_add
  This fix fixes doc discrepancy in tf.scatter_add.
  This fix fixes 20200
diff: @@ -394,7 +394,7 @@ def scatter_add(ref, indices, updates, use_locking=False, name=None):
  A tensor of indices into the first dimension of `ref`.
  updates: A `Tensor`. Must have the same type as `ref`.
  A tensor of updated values to store in `ref`.
  - use_locking: An optional `bool`. Defaults to `True`.
  + use_locking: An optional `bool`. Defaults to `False`.
  If True, the assignment will be protected by a lock;
  otherwise the behavior is undefined, but may exhibit less contention.
  name: A name for the operation (optional).
  