🌐 [i18n-KO] translate create_a_model doc to Korean (#22754)

docs: ko: translates create_a_model.mdx

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

docs/source/ko/_toctree.yml

@@ -22,8 +22,8 @@
   title: (번역중) 튜토리얼
 - sections:
   - sections:
-    - local: in_translation
-      title: (번역중) Create a custom architecture
+    - local: create_a_model
+      title: 맞춤형 아키텍처 만들기
     - local: custom_models
       title: 사용자 정의 모델 공유하기
     - local: run_scripts