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* Remove docs for deprecated ONNX export

* Tidy up the CLI help messages

* Revamp ONNX docs

* Update auto-config table

* Use DistilBERT as example for consistency

* Wrap up first pass at ONNX docs

* Fix table check

* Add tweaks and introduction

* Add cross-ref

* Fix missing import

* Fix style

* Add permalinks to ONNX configs

* Clarify role of OrderedDict

* Update docs/source/serialization.mdx
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Add doctest syntax to code blocks

* Remove permalinks

* Revert "Remove permalinks"

This reverts commit 099701daf0db27823457867938efdb2d4f22a7c1.
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>