[i18n-KO] Translated accelerate.mdx to Korean (#22830)

* docs: ko: init: accelerate.mdx

* docs: ko: translated: accelerate.mdx

* docs: ko: revised: natural expression accelerate.mdx

Co-Authored-By: Gabriel Yang <gabrielwithhappy@gmail.com>

* docs: ko: revised: natural expression2 accelerate.mdx

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

---------

Co-authored-by: Gabriel Yang <gabrielwithhappy@gmail.com>
Co-authored-by: Sohyun Sim <96299403+sim-so@users.noreply.github.com>

docs/source/ko/_toctree.yml

@@ -17,8 +17,8 @@
     title: 전처리
   - local: training
     title: 사전 학습된 모델 미세 조정하기
-  - local: in_translation
-    title: (번역중) Distributed training with 🤗 Accelerate
+  - local: accelerate
+    title: 🤗 Accelerate를 활용한 분산 학습
   - local: in_translation
     title: (번역중) Share a model
   title: (번역중) 튜토리얼