add xiaoxuqi as reviewer (Azure#17020)

Author: xiaoxuqi-ms

.github/pull_request_assignment.yml

@@ -152,6 +152,14 @@
     reviewers:
       - zhenglaizhang
 
+- rule:
+    paths:
+      - "specification/videoanalyzer/resource-manager/**"
+      - "specification/cognitiveservices/resource-manager/**"
+      - "specification/dataprotection/**"
+    reviewers:
+      - xiaoxuqi-ms
+      
 - rule:
     paths:
       - "documentation/**"