Fix kured installation instructions

Running the last instruction for installing `kured` seems to be failing on Ubuntu 22.04:

```bash
helm install my-release kubereboot/kured --namespace kured --set nodeSelector."kubernetes.io/os=linux"

Error: INSTALLATION FAILED: unable to build kubernetes objects from release manifest: error validating "": error validating data: ValidationError(DaemonSet.spec.template.spec.nodeSelector.kubernetes): invalid type for io.k8s.api.core.v1.PodSpec.nodeSelector: got "map", expected "string
```

Following [these instructions](rancher/rancher#13723) resolves the issue.

Author: PawelWMS

articles/aks/node-updates-kured.md

@@ -67,7 +67,7 @@ helm repo update
 kubectl create namespace kured
 
 # Install kured in that namespace with Helm 3 (only on Linux nodes, kured is not working on Windows nodes)
-helm install my-release kubereboot/kured --namespace kured --set nodeSelector."kubernetes.io/os"=linux
+helm install my-release kubereboot/kured --namespace kured --set controller.nodeSelector."kubernetes.io/os"=linux
 ```
 
 You can also configure additional parameters for `kured`, such as integration with Prometheus or Slack. For more information about additional configuration parameters, see the [kured Helm chart][kured-install].