message: TF2 doc: Add RecomputationCheckpoint to TF2.1 API doc
  Summary: TF2.1 only
  Reviewers: #tensorflow, simonl, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, markf
  Maniphest Tasks: T39809
diff: @@ -167,8 +167,8 @@ Keras layers
  .. automodule:: tensorflow.python.ipu.keras.layers
  - :members: Dropout, Embedding, GroupNormalization, InstanceNormalization, LayerNormalization, PopnnGRU, PopnnLSTM, SerialDense, CTCInferenceLayer, CTCPredictionsLayer
  - :imported-members: Dropout, Embedding, GroupNormalization, InstanceNormalization, LayerNormalization, PopnnGRU, PopnnLSTM, SerialDense, CTCInferenceLayer, CTCPredictionsLayer
  + :members: Dropout, Embedding, GroupNormalization, InstanceNormalization, LayerNormalization, PopnnGRU, PopnnLSTM, SerialDense, CTCInferenceLayer, CTCPredictionsLayer, RecomputationCheckpoint
  + :imported-members: Dropout, Embedding, GroupNormalization, InstanceNormalization, LayerNormalization, PopnnGRU, PopnnLSTM, SerialDense, CTCInferenceLayer, CTCPredictionsLayer, RecomputationCheckpoint
  Keras losses
  ^^^^^^^^^^^^
  