update codeowner and remove duplicated pull_request_assignment (#12635)

Author: ruowan

.github/pull_request_assignment.yml

@@ -160,12 +160,6 @@
       - josefree
       - akning-ms
 
-- rule:
-    paths:
-      - "documentation/**"	
-    reviewers:
-      - josefree
-      - akning-ms
 
 - rule:
     paths:

CODEOWNERS

@@ -78,4 +78,7 @@
 /specification/trafficmanager/ @allencal @hrkulkarmsft
 /specification/web/ @naveedaz @Azure/azure-app-service-control-plane
 /profile/ @shahabhijeet
-/specification/**/*.md @lirenhe
+/specification/**/readme.typescript.md @qiaozha
+/specification/**/readme.go.md @ArcturusZhang
+/specification/**/readme.java.md @ChenTanyi
+/specification/**/readme.python.md @jsntcy @msyyc