message: Docstring cleanups to remove references to tf.compat.v1.placeholder in example code.
diff: @@ -69,10 +69,18 @@ def frame(signal, frame_length, frame_step, pad_end=False, pad_value=0, axis=-1,
  For example:
  ```python
  - pcm = tf.compat.v1.placeholder(tf.float32, [None, 9152])
  - frames = tf.signal.frame(pcm, 512, 180)
  - magspec = tf.abs(tf.signal.rfft(frames, [512]))
  - image = tf.expand_dims(magspec, 3)
  + # A batch size 3 tensor of 9152 audio samples.
  + audio = tf.random.normal([3, 9152])
  +
  + # Compute overlapping frames of length 512 with a step of 180 (frames overlap
  + # by 332 samples). By default, only 50 frames are generated since the last
  + # 152 samples do not form a full frame.
  + frames = tf.signal.frame(audio, 512, 180)
  + frames.shape.assert_is_compatible_with([3, 50, 512])
  +
  + # When pad_end is enabled, the final frame is kept (padded with zeros).
  + frames = tf.signal.frame(audio, 512, 180, pad_end=True)
  + frames.shape.assert_is_compatible_with([3, 51, 512])
  ```
  Args:
  