docs: Update consul-k8s Helm chart docs (1.3.x)

Sync docs for recent changes to the Helm chart from `consul-k8s`.

website/content/docs/k8s/helm.mdx

@@ -759,6 +759,19 @@ Use these links to navigate to a particular top-level stanza.
     contains best practices and recommendations for selecting suitable
     hardware sizes for your Consul servers.
 
+  - `persistentVolumeClaimRetentionPolicy` ((#v-server-persistentvolumeclaimretentionpolicy)) (`map`) - The [Persistent Volume Claim (PVC) retention policy](https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/#persistentvolumeclaim-retention)
+    controls if and how PVCs are deleted during the lifecycle of a StatefulSet.
+    WhenDeleted specifies what happens to PVCs created from StatefulSet VolumeClaimTemplates when the StatefulSet is deleted, 
+    and WhenScaled specifies what happens to PVCs created from StatefulSet VolumeClaimTemplates when the StatefulSet is scaled down.
+
+    Example:
+
+    ```yaml
+    persistentVolumeClaimRetentionPolicy:
+      whenDeleted: Retain
+      whenScaled: Retain
+    ```
+
   - `connect` ((#v-server-connect)) (`boolean: true`) - This will enable/disable [service mesh](/consul/docs/connect). Setting this to true
     _will not_ automatically secure pod communication, this
     setting will only enable usage of the feature. Consul will automatically initialize