Add kvm2 version documentation

[josedonizetti]

Adding documentation for the change #4398

[k8s-ci-robot]

Hi @josedonizetti. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: josedonizetti
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[minikube-bot]

Can one of the admins verify this patch?

[medyagh]

Thanks for adding the docs.