Added small helpful tip to hello-minikube.md

[axlrosen]

When I ran kubectl get deployments, it showed no available nodes. So I thought I did something wrong. Eventually I ran it again and it matched the expected output. So, I would like to add a helpful hint to the documentation.

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[stmcginnis]

Looks good. I think this is enough and we don't need a full "Note" formatted block, but good to have a small hint that they may need to wait a little at this point before proceeding.

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: d637b5ea8646f5a94e25430d079d5b6cdcb6f47f

[dipesh-rawat]

Thanks!

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dipesh-rawat

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