🌐 [i18n-KO] Translated object_detection.mdx to Korean (#23164)

* translated object_detection.mdx
Co-Authored-By: Hyeonseo Yun <0525_hhgus@naver.com>
Co-Authored-By: Nayeon Han <nayeon2.han@gmail.com>
Co-Authored-By: simso <3035487+simso@users.noreply.github.com>
Co-Authored-By: Gabriel Yang <gabrielwithhappy@gmail.com>
Co-Authored-By: Wonhyeong Seo <wonhseo@kakao.com>
Co-Authored-By: Jungnerd <46880056+jungnerd@users.noreply.github.com>

* Apply suggestions from code review
Co-authored-by: Hyeonseo Yun <0525yhs@gmail.com>
Co-authored-by: Wonhyeong Seo <wonhseo@kakao.com>
Co-authored-by: Sohyun Sim <96299403+sim-so@users.noreply.github.com>

---------
Co-authored-by: Hyeonseo Yun <0525_hhgus@naver.com>
Co-authored-by: Nayeon Han <nayeon2.han@gmail.com>
Co-authored-by: simso <3035487+simso@users.noreply.github.com>
Co-authored-by: Gabriel Yang <gabrielwithhappy@gmail.com>
Co-authored-by: Wonhyeong Seo <wonhseo@kakao.com>
Co-authored-by: Jungnerd <46880056+jungnerd@users.noreply.github.com>
Co-authored-by: Hyeonseo Yun <0525yhs@gmail.com>
Co-authored-by: Sohyun Sim <96299403+sim-so@users.noreply.github.com>

docs/source/ko/_toctree.yml

@@ -56,8 +56,8 @@
         title: (번역중) Semantic segmentation
       - local: tasks/video_classification
         title: 영상 분류
-      - local: in_translation
-        title: (번역중) Object detection
+      - local: tasks/object_detection
+        title: 객체 탐지
       - local: tasks/zero_shot_object_detection
         title: 제로샷(zero-shot) 객체 탐지
       - local: tasks/zero_shot_image_classification