Added bucket schema example to tenant values file (#1657)

The previous comment implied it was a list of strings, which fails object creation in the cluster, so adding an example might save someone the time of having to look it up in the CRD or elsewhere

helm/tenant/values.yaml

@@ -99,7 +99,11 @@ tenant:
   features:
     bucketDNS: false
     domains: { }
-  ## List of bucket names to create during tenant provisioning
+  ## List of bucket definitions to create during tenant provisioning.
+  ## Example:
+  #   - name: my-minio-bucket
+  #     objectLock: false        # optional
+  #     region: us-east-1        # optional
   buckets: [ ]
   ## List of secret names to use for generating MinIO users during tenant provisioning
   users: [ ]