Update volumes examples that are no longer in staging (#15630)

* Update volumes examples that are no longer in staging

Update volumes examples that are no longer in staging 

per
https://github.com/kubernetes/examples/commit/c16a976d9830fda1692d61c5ca693a4c30ae4bcf

a lot of links are now broken in the docs

* Remove /staging from ceph examples

Remove /staging from ceph examples

content/en/docs/concepts/storage/volumes.md

@@ -208,7 +208,7 @@ writers simultaneously.
 You must have your own Ceph server running with the share exported before you can use it.
 {{< /caution >}}
 
-See the [CephFS example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/staging/volumes/cephfs/) for more details.
+See the [CephFS example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/volumes/cephfs/) for more details.
 
 ### cinder {#cinder}
 
@@ -534,7 +534,7 @@ simultaneously.
 You must have your own GlusterFS installation running before you can use it.
 {{< /caution >}}
 
-See the [GlusterFS example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/staging/volumes/glusterfs) for more details.
+See the [GlusterFS example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/volumes/glusterfs) for more details.
 
 ### hostPath {#hostpath}
 
@@ -618,7 +618,7 @@ and then serve it in parallel from as many Pods as you need.  Unfortunately,
 iSCSI volumes can only be mounted by a single consumer in read-write mode - no
 simultaneous writers allowed.
 
-See the [iSCSI example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/staging/volumes/iscsi) for more details.
+See the [iSCSI example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/volumes/iscsi) for more details.
 
 ### local {#local}
 
@@ -938,7 +938,7 @@ and then serve it in parallel from as many Pods as you need.  Unfortunately,
 RBD volumes can only be mounted by a single consumer in read-write mode - no
 simultaneous writers allowed.
 
-See the [RBD example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/staging/volumes/rbd) for more details.
+See the [RBD example](https://github.com/kubernetes/examples/tree/{{< param "githubbranch" >}}/volumes/rbd) for more details.
 
 ### scaleIO {#scaleio}
 
@@ -1052,7 +1052,7 @@ spec:
 ```
 
 For more information including Dynamic Provisioning and Persistent Volume Claims, please see the
-[StorageOS examples](https://github.com/kubernetes/examples/blob/master/staging/volumes/storageos).
+[StorageOS examples](https://github.com/kubernetes/examples/blob/master/volumes/storageos).
 
 ### vsphereVolume {#vspherevolume}