docs: fix headlamp addon instructions to use new k8s way of generating a token

[adwait-godbole]

Fixes headlamp-k8s/headlamp#2923

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[minikube-bot]

Can one of the admins verify this patch?

[illume]

I don't think it should be 24h. For a development system this is a bit tedious to have to create a new token every day.

kubectl create token headlamp-admin -n kube-system

If leaving it without an expiry is too much, what about a line telling the users about removing the duration if their minikube is just for development?

[illume]

Hi.

We give similar instructions for creating a token for headlamp addon with Kubernetes 1.24+ here: https://headlamp.dev/docs/latest/installation/