🌐 [i18n-KO] Translated model_doc/trajectory_transformer.md to Korean (#33597)

* docs: ko: model_doc/trajectory_transformer.md

* fix: resolve suggestions

Co-authored-by: HyeokJun SHIN <96534680+jun048098@users.noreply.github.com>

* fix: resolve suggestions

* fix: resolve suggestions

---------

Co-authored-by: HyeokJun SHIN <96534680+jun048098@users.noreply.github.com>

docs/source/ko/_toctree.yml

@@ -754,8 +754,8 @@
       sections:
       - local: in_translation
         title: (번역중) Decision Transformer
-      - local: in_translation
-        title: (번역중) Trajectory Transformer
+      - local: model_doc/trajectory_transformer
+        title: 궤적 트랜스포머
       title: (번역중) 강화학습 모델
     - isExpanded: false
       sections: