Update docs/kubernetes/clusters.md

Co-authored-by: Mikael Simberg <[email protected]>

Author: eliaoggian

docs/kubernetes/clusters.md

@@ -87,7 +87,8 @@ export KUBECONFIG=/home/user/kubeconfig.yaml
    kubectl get nodes
    ```
 
-> ⚠️ The kubeconfig file contains credentials. Keep it secure.
+!!! warning
+    The kubeconfig file contains credentials. Keep it secure.
 
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