add example to migration instructions

Author: asmacdo

changelog/fragments/1036-ansible-liveness.yaml

@@ -30,8 +30,17 @@ entries:
     # Migration can be defined to automatically add a section to
     # the migration guide. This is required for breaking changes.
     migration:
-      header: Header text for the migration section
+      header: **(Optional for Ansible-base operators)**  Add livenessProbe check
       body: >
         Existing operators will have a healthz endpoint without intervention,
         but to take advantage of it, a liveness probe should be manually added
-        to the operator manifest.
+        to the operator manifest. For example, the `deploy/operator.yaml` file would need to include:
+
+        ```yaml
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: 6789
+            initialDelaySeconds: 5
+            periodSeconds: 3
+        ```