🌐 [i18n-KO] Translated file_utils.md to Korean (#33803)

* docs: ko: file_utils.md

* feat: nmt draft

* fix: manual edits

* fix: resolve suggestions

Co-authored-by: Jiwook Han <33192762+mreraser@users.noreply.github.com>

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Co-authored-by: Jiwook Han <33192762+mreraser@users.noreply.github.com>

docs/source/ko/_toctree.yml

@@ -789,8 +789,8 @@
       title: (번역중) Utilities for Image Processors
     - local: internal/audio_utils
       title: 오디오 처리를 위한 유틸리티
-    - local: in_translation
-      title: (번역중) General Utilities
+    - local: internal/file_utils
+      title: 일반 유틸리티
     - local: internal/time_series_utils
       title: 시계열을 위한 유틸리티
     title: (번역중) Internal Helpers