🌐 [i18n-KO] Translated `main_classes/keras_callbacks.md` to Korean (#33955)
* docs: ko: main_classes/keras_callbacks.md
* fix: resolve suggestions
Co-authored-by: Ahnjj_DEV <ahnjj.dev@gmail.com>
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Co-authored-by: Ahnjj_DEV <ahnjj.dev@gmail.com>