Improve documentation around ONNX export (#666)
* improve doc
* Update docs/source/exporters/onnx/usage_guides/export_a_model.mdx
Co-authored-by: Michael Benayoun <mickbenayoun@gmail.com>
* fix reference to ortmodel
* Update docs/source/exporters/onnx/usage_guides/export_a_model.mdx
* Update docs/source/exporters/onnx/usage_guides/export_a_model.mdx
* Update docs/source/exporters/onnx/usage_guides/export_a_model.mdx
* Update docs/source/exporters/onnx/usage_guides/export_a_model.mdx
* Update docs/source/exporters/onnx/usage_guides/export_a_model.mdx
Co-authored-by: Michael Benayoun <mickbenayoun@gmail.com>