message: import doc_controls directly.
diff: # TensorFlow isn't a dependency of tflite-support pip package. It's only
  # required in the API docgen pipeline so we'll ignore it if tensorflow is not
  # installed.
  -# pylint: disable=g-import-not-at-top
  +# pylint: disable=g-import-not-at-top,unused-import
  try:
  - from tensorflow.tools import docs
  - doc_controls = docs.doc_controls
  + from tensorflow.tools.docs import doc_controls
  except ModuleNotFoundError:
  # Replace the real doc_controls with MagicMock to ignore all calls to it.
  from unittest import mock
  doc_controls = mock.MagicMock()
  -# pylint: enable=g-import-not-at-top
  +# pylint: enable=g-import-not-at-top,unused-import
  