🌐 [i18n-KO] Translated`tasks/document_question_answering.md` to Korean (#24588)

* docs: ko: `document_question_answering.md`

* fix: resolve suggestions
Co-authored-by: Sohyun Sim <96299403+sim-so@users.noreply.github.com>

* fix: resolve suggestions
Co-authored-by: Hyeonseo Yun <0525yhs@gmail.com>
Co-authored-by: Sohyun Sim <96299403+sim-so@users.noreply.github.com>

---------
Co-authored-by: Sohyun Sim <96299403+sim-so@users.noreply.github.com>
Co-authored-by: Hyeonseo Yun <0525yhs@gmail.com>

docs/source/ko/_toctree.yml

@@ -69,9 +69,9 @@
   - sections:
       - local: tasks/image_captioning
         title: 이미지 캡셔닝
-      - local: in_translation
-        title: (번역중) Document Question Answering
-    title: (번역중) 멀티모달
+      - local: tasks/document_question_answering
+        title: 문서 질의 응답(Document Question Answering)
+    title: 멀티모달
     isExpanded: false
   title: 태스크 가이드
 - sections: