Reflect RoCm support in the documentation (#27636)
* reflect RoCm support in the documentation
* Update docs/source/en/main_classes/trainer.md
Co-authored-by: Lysandre Debut <hi@lysand.re>
* fix review comments
* use ROCm instead of RoCm
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Co-authored-by: Lysandre Debut <hi@lysand.re>
