Update distributed_inference.md to include `transformer.device_map` (#9553)
* Update distributed_inference.md to include `transformer.device_map`
* Update docs/source/en/training/distributed_inference.md
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>