* Small fixes to (un)patch_tensorflow api doc and make its import path in api doc show as the recommended one
* Add api doc for nano_bf16 decorator
* Move api doc for bigdl.nano.tf.keras.InferenceOptimizer out of bigdl.nano.tf.keras to make it more clear
* Fix python styles
* Fix path in Nano PyTorch API docs
* Add api doc for bigdl.nano.pytorch.patching.patch_encryption
* Add a note box for bigdl.nano.pytorch.patching.patch_encryption api doc
* Fix Python style again
* Fix path in Nano HPO API doc and other small fixes