Add new entry in glossary for naked-pod

[dejanu]

The glossary page should contain an entry for naked-pod definition.

Various tutorials and docs refer to naked-pods, thus, including an entry in the official glossary of terms would be highly beneficial for newcomers.

[k8s-ci-robot]

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[lmktfy]

See #51236 (comment) for some feedback.

[lmktfy]

/language en

[lmktfy]

If folks agree with the change:
/retitle Add new entry in glossary for "bare pod"

Not convinced? Try asking people about running Kubernetes on naked metal. Or, uh, don't ask Google - and definitely not at work.