Update metallb example configs

[caruccio]

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Update metallb example configs

[k8s-ci-robot]

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[floryut]

@caruccio Thank you!

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: caruccio, floryut

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[yankay]

Thanks @caruccio
/lgtm

[noriban]

shouldn't it be like this?
controller:

[caruccio]

Nice catch ;)

[caruccio]

Done, thanks: #10545