🌐 [i18n-KO] Translated `perf_train_cpu.md` to Korean (#24911)
* dos: ko: perf_train_cpu.md
* feat: chatgpt draft
* fix: manual edits
* fix: resolve suggestions
* fix: manual edits
Co-authored-by: Haewon Kim <ehdvkf02@naver.com>
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Co-authored-by: Haewon Kim <ehdvkf02@naver.com>