Minor documentation fix

[Kawron]

Currently the documentation states that users should enabled the coreDNS by running:

microk8s enable dsn:<ip>

However, the microk8s (installed as in the instructions) comes with coreDNS addon enabled by default. So this command will not work and will not update the dns servers. I've added a more extensive documentation based on microk8s docs.

I've also fixed a typo

[github-actions]

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