Update cloning docs to reflect beta for 1.16 (#16013)

Updates the feature status for VolumePVCDataSource to 1.16/beta in the
docs.

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

@@ -682,7 +682,7 @@ spec:
 
 ## Volume Cloning
 
-{{< feature-state for_k8s_version="v1.15" state="alpha" >}}
+{{< feature-state for_k8s_version="v1.16" state="beta" >}}
 
 Volume clone feature was added to support CSI Volume Plugins only. For details, see [volume cloning](/docs/concepts/storage/volume-pvc-datasource/).
 

content/en/docs/concepts/storage/volume-pvc-datasource.md

@@ -11,7 +11,7 @@ weight: 30
 
 {{% capture overview %}}
 
-{{< feature-state for_k8s_version="v1.15" state="alpha" >}} 
+{{< feature-state for_k8s_version="v1.16" state="beta" >}}
 This document describes the concept of cloning existing CSI Volumes in Kubernetes.  Familiarity with [Volumes](/docs/concepts/storage/volumes) is suggested.
 
 This feature requires VolumePVCDataSource feature gate to be enabled:
@@ -40,6 +40,10 @@ Users need to be aware of the following when using this feature:
 * Cloning support is only available for dynamic provisioners.
 * CSI drivers may or may not have implemented the volume cloning functionality.
 * You can only clone a PVC when it exists in the same namespace as the destination PVC (source and destination must be in the same namespace).
+* Cloning is only supported within the same Storage Class.
+    - Destination volume must be the same storage class as the source
+    - Default storage class can be used and storageClassName omitted in the spec
+
 
 ## Provisioning
 
@@ -54,6 +58,7 @@ metadata:
 spec:
   accessModes:
   - ReadWriteOnce
+  storageClassName: cloning
   resources:
     requests:
       storage: 5Gi

content/en/docs/reference/command-line-tools-reference/feature-gates.md

@@ -175,7 +175,8 @@ different Kubernetes components.
 | `TokenRequestProjection` | `false` | Alpha | 1.11 | 1.11 |
 | `TokenRequestProjection` | `true` | Beta | 1.12 | |
 | `TTLAfterFinished` | `false` | Alpha | 1.12 | |
-| `VolumePVCDataSource` | `false` | Alpha | 1.15 | |
+| `VolumePVCDataSource` | `false` | Alpha | 1.15 | 1.15 |
+| `VolumePVCDataSource` | `true` | Beta | 1.16 | |
 | `VolumeScheduling` | `false` | Alpha | 1.9 | 1.9 |
 | `VolumeScheduling` | `true` | Beta | 1.10 | 1.12 |
 | `VolumeScheduling` | `true` | GA | 1.13 | |