message: Fixed a typo in `group_by_window` documentation
diff: @@ -45,7 +45,7 @@ def group_by_window(key_func,
  key_func: A function mapping a nested structure of tensors
  (having shapes and types defined by `self.output_shapes` and
  `self.output_types`) to a scalar `tf.int64` tensor.
  - reduce_func: A function mapping a key and a dataset of up to `batch_size`
  + reduce_func: A function mapping a key and a dataset of up to `window_size`
  consecutive elements matching that key to another dataset.
  window_size: A `tf.int64` scalar `tf.Tensor`, representing the number of
  consecutive elements matching the same key to combine in a single
  