message: Fix incorrect example in tf.data.Dataset.window
  This fix fixes an incorrect example in tf.data.Dataset.window
  The previous example:
  ```
  tf.data.Dataset.from_tensor_slices((range(4), range(4)).window(2)
  ```
  does not have close parentheses, and should be
  ```
  tf.data.Dataset.from_tensor_slices((range(4), range(4))).window(2)
  ```
diff: @@ -1377,7 +1377,7 @@ class DatasetV2(tracking_base.Trackable, composite_tensor.CompositeTensor):
  For example:
  - - `tf.data.Dataset.from_tensor_slices((range(4), range(4)).window(2)`
  + - `tf.data.Dataset.from_tensor_slices((range(4), range(4))).window(2)`
  produces `{({0, 1}, {0, 1}), ({2, 3}, {2, 3})}`
  - `tf.data.Dataset.from_tensor_slices({"a": range(4)}).window(2)`
  produces `{{"a": {0, 1}}, {"a": {2, 3}}}`
  