message: improve docstring for tf.data.Dataset.random
diff: @@ -2657,8 +2657,20 @@ name=None))
  def random(seed=None):
  """create a `Dataset` of pseudorandom values.
  + The dataset generates an indefinite number of pseudorandom values.
  + In order to generate datasets with reproducible pseudorandom values,
  + the `seed` value can be passed while initializing the dataset.
  +
  + >>> ds1 = tf.data.Dataset.random(seed=4).take(10)
  + >>> ds2 = tf.data.Dataset.random(seed=4).take(10)
  + >>> print(list(ds2.as_numpy_iterator())==list(ds2.as_numpy_iterator()))
  + True
  +
  Args:
  seed: (Optional) the seed value for generating pseudorandom values.
  +
  + Returns:
  + A `tf.data.Dataset`
  """
  return RandomDataset(seed=seed)
  