Update frontend.yaml

Author: network-charles

content/en/examples/controllers/frontend.yaml

@@ -3,7 +3,7 @@ kind: ReplicaSet
 metadata:
   name: frontend
   labels:
-    app: guestbook
+    app: nginx
     tier: frontend
 spec:
   # modify replicas according to your case
@@ -17,5 +17,5 @@ spec:
         tier: frontend
     spec:
       containers:
-      - name: php-redis
-        image: gcr.io/google_samples/gb-frontend:v3
+      - name: nginx
+        image: nginx