Update pull_request_assignment.yml (Azure#13292)

Author: ruowan

.github/pull_request_assignment.yml

@@ -45,7 +45,7 @@
       - kairu-ms
 
 - rule:
-    paths: "specification/@(resources|powerplatform|appplatform)/**"
+    paths: "specification/@(resources|powerplatform|appplatform|deviceupdate)/**"
     reviewers:
       - raych1
 
@@ -157,7 +157,7 @@
     paths:
       - "specification/servicelinker/**"
     reviewers:
-      - PhoenixHe-msft
+      - raych1
 
 - rule:
     paths: