message: Added documentation for param n in DCT.
diff: @@ -69,7 +69,10 @@ def dct(input, type=2, n=None, axis=-1, norm=None, name=None): # pylint: disabl
  input: A `[..., samples]` `float32` `Tensor` containing the signals to
  take the DCT of.
  type: The DCT type to perform. Must be 1, 2 or 3.
  - n: For future expansion. The length of the transform. Must be `None`.
  + n: The length of the transform. If length is less than sequence length,
  + only the first n elements of the sequence are considered for the DCT.
  + If n is greater than the sequence length, zeros are padded and then
  + the DCT is computed as usual.
  axis: For future expansion. The axis to compute the DCT along. Must be `-1`.
  norm: The normalization to apply. `None` for no normalization or `'ortho'`
  for orthonormal normalization.
  