message: Define __call__ instead of call in example tf.Module
diff: @@ -1260,7 +1260,7 @@ def function(func=None,
  ... self.v = None
  ...
  ... @tf.function
  - ... def call(self, x):
  + ... def __call__(self, x):
  ... if self.v is None:
  ... self.v = tf.Variable(tf.ones_like(x))
  ... return self.v * x
  