🌐 [i18n-KO] Translated model_summary.md to Korean (#24625)

* docs: ko: model_summary.md

* feat: nmt and manual edit model_summary.mdx

* fix: resolve suggestions

Co-authored-by: Sohyun Sim <96299403+sim-so@users.noreply.github.com>
Co-authored-by: Wonhyeong Seo <wonhseo@kakao.com>

* fix: resolve suggestions2

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: Wonhyeong Seo <wonhseo@kakao.com>

docs/source/ko/_toctree.yml

@@ -166,8 +166,8 @@
     title: 🤗 Transformers로 할 수 있는 작업
   - local: tasks_explained
     title: 🤗 Transformers로 작업을 해결하는 방법
-  - local: in_translation
-    title: (번역중) The Transformer model family
+  - local: model_summary
+    title: Transformer 모델군
   - local: in_translation
     title: (번역중) Summary of the tokenizers
   - local: attention