Add note for bare-metal driver

[pfuntner]

I open an issue (#5308) while trying the command to create the second local cluster. It turns out that this operation isn't supported with a bare-metal (none) driver and the code is being changed to catch this restriction early.

I thought it might be nice to add a warning to the examples page as well.

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[k8s-ci-robot]

Hi @pfuntner. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[minikube-bot]

Can one of the admins verify this patch?

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pfuntner
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[pfuntner]

I signed it

[tstromberg]

Looks good. Thank you!