Merge pull request #2168 from tormath1/tormath1/sg

📖 docs/configuration: fix security groups example

Author: k8s-ci-robot

docs/book/src/clusteropenstack/configuration.md

@@ -598,7 +598,8 @@ spec:
   template:
     spec:
       securityGroups:
-      - name: allow-ssh
+      - filter:
+          name: allow-ssh
 ```
 
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