message: Add a testable example to tf.math.rsqrt
diff: @@ -7,4 +7,13 @@ op {
  name: "rsqrt"
  deprecation_version: 2
  }
  + description: <<END
  +I.e., \\(y = 1 / \sqrt{x}\\).
  +
  +Example:
  +>>> x = tf.constant([2., 0., -2.])
  +>>> tf.math.rsqrt(x)
  +<tf.Tensor: shape=(3,), dtype=float32, numpy=array([0.70710677, inf, nan], dtype=float32)>
  +
  +END
  }
  