Added ingressClassName: nginx to Ingress example, mentioned to the necessity of it and referenced to the section describing that further

content/en/examples/service/networking/default-ingressclass.yaml

@@ -0,0 +1,10 @@
+apiVersion: networking.k8s.io/v1
+kind: IngressClass
+metadata:
+  labels:
+    app.kubernetes.io/component: controller
+  name: nginx-example
+  annotations:
+    ingressclass.kubernetes.io/is-default-class: "true"
+spec:
+  controller: k8s.io/ingress-nginx

content/en/examples/service/networking/minimal-ingress.yaml

@@ -5,6 +5,7 @@ metadata:
   annotations:
     nginx.ingress.kubernetes.io/rewrite-target: /
 spec:
+  ingressClassName: nginx-example
   rules:
   - http:
       paths: