updated API version in two places

Author: Audrey Spaulding

modules/virt-creating-vm-snapshot-cli.adoc

@@ -20,7 +20,7 @@ You can create a virtual machine (VM) snapshot for an offline or online VM by cr
 +
 [source,yaml]
 ----
-apiVersion: snapshot.kubevirt.io/v1alpha1
+apiVersion: snapshot.kubevirt.io/v1beta1
 kind: VirtualMachineSnapshot
 metadata:
   name: <snapshot_name>
@@ -76,7 +76,7 @@ $ oc describe vmsnapshot <snapshot_name>
 .Example output
 [source,yaml]
 ----
-apiVersion: snapshot.kubevirt.io/v1alpha1
+apiVersion: snapshot.kubevirt.io/v1beta1
 kind: VirtualMachineSnapshot
 metadata:
   creationTimestamp: "2020-09-30T14:41:51Z"
@@ -86,7 +86,7 @@ metadata:
   name: mysnap
   namespace: default
   resourceVersion: "3897"
-  selfLink: /apis/snapshot.kubevirt.io/v1alpha1/namespaces/default/virtualmachinesnapshots/my-vmsnapshot
+  selfLink: /apis/snapshot.kubevirt.io/v1beta1/namespaces/default/virtualmachinesnapshots/my-vmsnapshot
   uid: 28eedf08-5d6a-42c1-969c-2eda58e2a78d
 spec:
   source:

modules/virt-restoring-vm-from-snapshot-cli.adoc

@@ -51,7 +51,7 @@ $ oc get vmrestore <vm_restore>
 .Example output
 [source, yaml]
 ----
-apiVersion: snapshot.kubevirt.io/v1alpha1
+apiVersion: snapshot.kubevirt.io/v1beta1
 kind: VirtualMachineRestore
 metadata:
 creationTimestamp: "2020-09-30T14:46:27Z"
@@ -66,7 +66,7 @@ ownerReferences:
   name: my-vm
   uid: 355897f3-73a0-4ec4-83d3-3c2df9486f4f
   resourceVersion: "5512"
-  selfLink: /apis/snapshot.kubevirt.io/v1alpha1/namespaces/default/virtualmachinerestores/my-vmrestore
+  selfLink: /apis/snapshot.kubevirt.io/v1beta1/namespaces/default/virtualmachinerestores/my-vmrestore
   uid: 71c679a8-136e-46b0-b9b5-f57175a6a041
   spec:
     target: