Merge pull request kubernetes-sigs#2120 from chess-knight/fix/v1beta1…

…_dnsNameservers_change_doc

📖 Fix dnsNameservers array in the v1beta1 changes docs

docs/book/src/topics/crd-changes/v1alpha7-to-v1beta1.md

@@ -370,15 +370,17 @@ In v1beta1, `OpenStackCluster.Spec.ManagedSubnets` array field is introduced. Th
 
 ```yaml
   nodeCidr: "10.0.0.0/24"
-  dnsNameservers: "10.0.0.123"
+  dnsNameservers:
+  - "10.0.0.123"
 ```
 
 In v1beta1, this will be automatically converted to:
 
 ```yaml
   managedSubnets:
   - cidr: "10.0.0.0/24"
-    dnsNameservers: "10.0.0.123"
+    dnsNameservers:
+    - "10.0.0.123"
 ```
 
 Please note that currently `managedSubnets` can only hold one element.