[bnb] Move documentation (#18671)
* fix bnb documentation
- move bnb documentation to `infer_gpu_many`
* small refactoring
- added text on infer_gpu_one
- added a small note on infer_gpu_many
- added customized multi gpu example on infer_gpu_many
* Update docs/source/en/perf_infer_gpu_many.mdx
Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>
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Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>
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Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>
Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>