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* Change transformers.onnx to use optimum.exporters.onnx

* Update doc

* Remove print

* Fix transformers.onnx cli

* Update documentation

* Update documentation

* Small fixes

* Fix log message

* Apply suggestions

* Update src/transformers/onnx/__main__.py
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Apply suggestions

* Add missing line break

* Ran make fix-copies

* Update src/transformers/onnx/__main__.py
Co-authored-by: lewtun <lewis.c.tunstall@gmail.com>

* Update src/transformers/onnx/__main__.py
Co-authored-by: lewtun <lewis.c.tunstall@gmail.com>
Co-authored-by: Michael Benayoun <michael@huggingface.co>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: lewtun <lewis.c.tunstall@gmail.com>