🌐 [i18n-KO] Translated tasks_summary.mdx to Korean (#23977)

* 🌐

 [i18n-KO] Translated tasks_summary.mdx to Korean
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: Gabriel Yang <gabrielwithhappy@gmail.com>
Co-Authored-By: Jungnerd <46880056+jungnerd@users.noreply.github.com>
Co-Authored-By: Nayeon Han <nayeon2.han@gmail.com>

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

* Update _toctree.yml

* Delete generation_strategies.mdx

* Delete tasks_explained.mdx

---------
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: Gabriel Yang <gabrielwithhappy@gmail.com>
Co-authored-by: Jungnerd <46880056+jungnerd@users.noreply.github.com>
Co-authored-by: Nayeon Han <nayeon2.han@gmail.com>

docs/source/ko/_toctree.yml

@@ -156,8 +156,8 @@
     title: (번역중) Philosophy
   - local: in_translation
     title: (번역중) Glossary
-  - local: in_translation
-    title: (번역중) 🤗 What 🤗 Transformers can do
+  - local: task_summary
+    title: 🤗 Transformers로 할 수 있는 작업
   - local: tasks_explained
     title: 🤗 Transformers로 작업을 해결하는 방법
   - local: in_translation