Update pull_request_assignment.yml (#12287)

Author: ruowan

.github/pull_request_assignment.yml

@@ -59,7 +59,6 @@
     paths: "specification/compute/**"
     reviewers:
       - ArcturusZhang
-      - fengzhou-msft
       - yungezz
 
 - rule:
@@ -107,7 +106,6 @@
       - allenjzhang
 - rule:
     paths:
-      - "specification/@(keyvault|notificationhubs)/**"
       - "specification/@(databricks|containerregistry)/**"
     reviewers:
       - fengzhou-msft
@@ -117,7 +115,6 @@
       - "specification/@(containerservice|containerinstance)/**"
     reviewers:
       - PhoenixHe-msft
-      - fengzhou-msft
       - yungezz
 
 - rule: