Update pull_request_assignment.yml (#12364)

* Update pull_request_assignment.yml

* Update pull_request_assignment.yml

* Update pull_request_assignment.yml

Author: ruowan

.github/pull_request_assignment.yml

@@ -40,7 +40,12 @@
     paths: "specification/@(resources|powerplatform|appplatform)/**"
     reviewers:
       - raych1
-
+      
+- rule:
+    paths: "specification/@(security|edgeorder|synapse)/**"
+    reviewers:
+      - ruowan
+      
 - rule:
     paths: "specification/sql/**"
     reviewers: