Add selector on the squid deployment manifest (#7646)

content/en/docs/tasks/traffic-management/egress/http-proxy/index.md

@@ -72,6 +72,9 @@ This example uses [Squid](http://www.squid-cache.org) but you can use any HTTPS
       namespace: external
     spec:
       replicas: 1
+      selector:
+        matchLabels:
+          app: squid
       template:
         metadata:
           labels:

content/zh/docs/tasks/traffic-management/egress/http-proxy/index.md

@@ -59,6 +59,9 @@ aliases:
       namespace: external
     spec:
       replicas: 1
+      selector:
+        matchLabels:
+          app: squid
       template:
         metadata:
           labels: