Move example-ingress.yaml

The commit (a79db9d) made the sample
YAML for Ingress a standalone file, but it was placed into a NEW
`examples/ingress` directory. This PR moves it to
`examples/service/networking` subdirectory where all other Ingress
examples are located. Having a single file under a dedicated directory
seems not good.

Author: tengqm

content/en/docs/tasks/access-application-cluster/ingress-minikube.md

@@ -132,12 +132,12 @@ The following file is an Ingress resource that sends traffic to your Service via
 
 1. Create `example-ingress.yaml` from the following file:
 
-  {{< codenew file="ingress/example-ingress.yaml" >}}
+  {{< codenew file="service/networking/example-ingress.yaml" >}}
 
 1. Create the Ingress resource by running the following command:
 
     ```shell
-    kubectl apply -f https://k8s.io/examples/ingress/example-ingress.yaml
+    kubectl apply -f https://k8s.io/examples/service/networking/example-ingress.yaml
     ```
 
     Output: