message: Update Release notes for CUDA 11 and CuDNN 8.0.2 support.
diff: shape assumptions (note that you can pass shapes with `None` entries for axes
  that are meant to be dynamic). You can also disable the input checking
  entirely by setting `model.input_spec = None`.
  +* TF pip packages now use CUDA11 and cuDNN 8.0.2.
  * XLA:CPU and XLA:GPU devices are no longer registered by default. Use
  `TF_XLA_FLAGS=--tf_xla_enable_xla_devices` if you really need them (to be
  removed).
  