Update install-minikube.md

[tjvdmolen]

Clarify that the --vm-driver none option only works on a linux environment

kubernetes/minikube#2727

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[tjvdmolen]

I signed the cla as of 5 minutes ago

[tengqm]

/lgtm

[jimangel]

/lgtm

[cody-clark]

/approve

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