Update installHint doc upon feedback in user-facing docs

[ankeesler]

Signed-off-by: Andrew Keesler akeesler@vmware.com

This change comes from the website docs PR: kubernetes/website#22441.

The belief here is that the proposed installHint doc makes it easier for website docs readers to understand what the installHint field does. It also nicely parallels the InstallHint Go field doc.

It also also introduces valid YAML to the kubeconfig example.

CC @enj

[k8s-ci-robot]

Hi @ankeesler. Thanks for your PR.

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[enj]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

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This pull-request has been approved by: ankeesler, enj

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