message: Update the docstring for tf.nn.elu.
diff: op {
  graph_op_name: "Elu"
  - summary: "Computes exponential linear: `exp(features) - 1` if < 0, `features` otherwise."
  + summary: "Computes the exponential linear function."
  description: <<END
  +The ELU function is defined as:
  +
  + * $ e ^ x - 1 $ if $ x < 0 $
  + * $ x $ if $ x >= 0 $
  +
  +Examples:
  +
  +>>> tf.nn.elu(1.0)
  +<tf.Tensor: shape=(), dtype=float32, numpy=1.0>
  +>>> tf.nn.elu(0.0)
  +<tf.Tensor: shape=(), dtype=float32, numpy=0.0>
  +>>> tf.nn.elu(-1000.0)
  +<tf.Tensor: shape=(), dtype=float32, numpy=-1.0>
  +
  See [Fast and Accurate Deep Network Learning by Exponential Linear Units (ELUs)
  ](http://arxiv.org/abs/1511.07289)
  END
  