Refactor bitsandbytes doc (#37668)
* doc
* torch ops
* fix
* nits
* Update docs/source/en/quantization/bitsandbytes.md
Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>
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Co-authored-by: Marc Sun <57196510+SunMarc@users.noreply.github.com>
