[en] update en docs to use recommended labels

content/en/examples/service/networking/dual-stack-default-svc.yaml

@@ -3,10 +3,10 @@ kind: Service
 metadata:
   name: my-service
   labels:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
 spec:
   selector:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
   ports:
     - protocol: TCP
       port: 80

content/en/examples/service/networking/dual-stack-ipfamilies-ipv6.yaml

@@ -3,12 +3,12 @@ kind: Service
 metadata:
   name: my-service
   labels:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
 spec:
   ipFamilies:
   - IPv6
   selector:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
   ports:
     - protocol: TCP
       port: 80

content/en/examples/service/networking/dual-stack-ipv6-svc.yaml

@@ -5,8 +5,8 @@ metadata:
 spec:
   ipFamily: IPv6
   selector:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
   ports:
     - protocol: TCP
       port: 80
-      targetPort: 9376
+      targetPort: 9376

content/en/examples/service/networking/dual-stack-prefer-ipv6-lb-svc.yaml

@@ -3,14 +3,14 @@ kind: Service
 metadata:
   name: my-service
   labels:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
 spec:
   ipFamilyPolicy: PreferDualStack
   ipFamilies:
   - IPv6
   type: LoadBalancer
   selector:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
   ports:
     - protocol: TCP
       port: 80

content/en/examples/service/networking/dual-stack-preferred-ipfamilies-svc.yaml

@@ -3,14 +3,14 @@ kind: Service
 metadata:
   name: my-service
   labels:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
 spec:
   ipFamilyPolicy: PreferDualStack
   ipFamilies:
   - IPv6
   - IPv4
   selector:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
   ports:
     - protocol: TCP
       port: 80

content/en/examples/service/networking/dual-stack-preferred-svc.yaml

@@ -3,11 +3,11 @@ kind: Service
 metadata:
   name: my-service
   labels:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
 spec:
   ipFamilyPolicy: PreferDualStack
   selector:
-    app: MyApp
+    app.kubernetes.io/name: MyApp
   ports:
     - protocol: TCP
       port: 80