Fix busybox `nslookup` example (#13071)
* Similarly to https://github.com/kubernetes/website/pull/9901 pin busybox image to 1.28. Although https://bugs.busybox.net/show_bug.cgi?id=11161 is closed, this still doesn't work on images > 1.28 * remove `/bin/sh` from the command to be executed on busybox, this leads to `/bin/sh: can't open 'nslookup': No such file or directory`
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			@ -160,7 +160,7 @@ Using `nslookup` on the Pods' hostnames, you can examine their in-cluster DNS
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addresses.
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```shell
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kubectl run -i --tty --image busybox dns-test --restart=Never --rm /bin/sh 
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kubectl run -i --tty --image busybox:1.28 dns-test --restart=Never --rm  
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nslookup web-0.nginx
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Server:    10.0.0.10
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Address 1: 10.0.0.10 kube-dns.kube-system.svc.cluster.local
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