message: Fix the Consistency of shape example
diff: @@ -341,9 +341,9 @@ x = tf.while_loop(
  The same restriction in AutoGraph code:
  ```
  -x = tf.constant(0, dtype=tf.int32)
  +x = tf.constant(1,)
  while tf.random.uniform(()) > 0.5:
  - x = tf.constant(0, dtype=tf.float32) # Error -- inconsistent shapes: (), (3,)
  + x = tf.constant((1, 2, 3)) # Error -- inconsistent shapes: (), (3,)
  ```
  ### Undefined and None values in TensorFlow
  