🌐 [i18n-KO] Translated `trainer_utils.md` to Korean (#33817)
* docs: ko: trainer_utils.md
* feat: nmt draft
* fix: manual edits
* fix: resolve suggestions
Co-authored-by: Woojun Jung <46880056+jungnerd@users.noreply.github.com>
---------
Co-authored-by: Woojun Jung <46880056+jungnerd@users.noreply.github.com>