update url of readme_zh

Former-commit-id: 603574b381

README.md

@@ -1,7 +1,7 @@
 ![PCM](https://www.gitlink.org.cn/images/avatars/Organization/123822?t=1689062058)
 <p align="center">  
   <a href="https://www.gitlink.org.cn/JointCloud/pcm-coordinator/tree/master/docs">Docs</a> |  
-  <a href="./README_zh.md">简体中文</a> |   
+  <a href="https://www.gitlink.org.cn/JointCloud/pcm-coordinator/tree/master/docs">简体中文</a> |   
   <a href="https://www.gitlink.org.cn/JointCloud/pcm-coordinator/milestones">Milestones</a>  
 </p>