message: fixed string_hash_bucket usage example
diff: @@ -521,7 +521,7 @@ def string_to_hash_bucket(input, num_buckets, name=None):
  Examples:
  >>> tf.strings.to_hash_bucket(["Hello", "TensorFlow", "2.x"], 3)
  - <tf.Tensor: id=332, shape=(3,), dtype=int64, numpy=array([2, 0, 1], dtype=int64)>
  + <tf.Tensor: shape=(3,), dtype=int64, numpy=array([2, 0, 1], dtype=int64)>
  Args:
  input: A `Tensor` of type `string`.
  