Fix kvm trobleshoot documentation

[josedonizetti]

Sorry! I forgot to add net-start on the documentation. When using net-define it creates a persistent network but doesn't start it, different from net-create that creates a transient network and starts it (minikube doesn't work with a transient network)

[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?

[tstromberg]

Thank you!