Example links use kubernetes/examples

Fix #5203

Previously, many of the Kubernetes links used
`https://github.com/kubernetes/kubernetes/examples`. This directory was
deprecated through
https://github.com/kubernetes/kubernetes/commit/cb712e41d435dbb42519bded680fef4043dd23b3,
in favor of the new `examples` repo hosted at
`https://github.com/kubernetes/examples`. This commit updates all links
accordingly.

docs/tutorials/stateful-application/basic-stateful-set.md

@@ -23,7 +23,7 @@ following Kubernetes concepts.
 * [Cluster DNS](/docs/concepts/services-networking/dns-pod-service/)
 * [Headless Services](/docs/concepts/services-networking/service/#headless-services)
 * [PersistentVolumes](/docs/concepts/storage/volumes/)
-* [PersistentVolume Provisioning](http://releases.k8s.io/{{page.githubbranch}}/examples/persistent-volume-provisioning/)
+* [PersistentVolume Provisioning](https://github.com/kubernetes/examples/tree/{{page.githubbranch}}/staging/persistent-volume-provisioning/)
 * [StatefulSets](/docs/concepts/abstractions/controllers/statefulsets/)
 * [kubectl CLI](/docs/user-guide/kubectl)
 

docs/tutorials/stateful-application/zookeeper.md

@@ -26,7 +26,7 @@ Kubernetes concepts.
 * [Cluster DNS](/docs/concepts/services-networking/dns-pod-service/)
 * [Headless Services](/docs/concepts/services-networking/service/#headless-services)
 * [PersistentVolumes](/docs/concepts/storage/volumes/)
-* [PersistentVolume Provisioning](http://releases.k8s.io/{{page.githubbranch}}/examples/persistent-volume-provisioning/)
+* [PersistentVolume Provisioning](https://github.com/kubernetes/examples/tree/{{page.githubbranch}}/staging/persistent-volume-provisioning/)
 * [ConfigMaps](/docs/tasks/configure-pod-container/configmap/)
 * [StatefulSets](/docs/concepts/abstractions/controllers/statefulsets/)
 * [PodDisruptionBudgets](/docs/admin/disruptions/#specifying-a-poddisruptionbudget)