API conventions: add more on defaulting

[thockin]

In reviewing an issue/PR I realized this lesson had not been documented anywhere. This is not the ideal mechanism, IMO, but better than nothing.

This comes out of Service ClusterIP and NodePorts, plus #103546

@robscott @aojea @khenidak @liggitt @msau42

[k8s-ci-robot]

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[thockin]

Also @apelisse - it might be interesting to denote some fields as +patchOnUnset or something?

[thockin]

Oh, this needs a TOC update - didn't we have a tool for that?

Edit: done

[thockin]

All comments addressed in the text, I hope. Compare: https://github.com/kubernetes/community/compare/86597c5414674efde1ef8d3ab8de2b3306d87990..7cbe84067ec732f27e2d73d9fa3facc649354757

[apelisse]

Looks great to me, thanks

[aojea]

LGTM

defer to @liggitt

[thockin]

Small updates made and pushed: https://github.com/kubernetes/community/compare/7cbe84067ec732f27e2d73d9fa3facc649354757..c307bcaa46e51b3b51a944237185932a47d6af23

[liggitt]

/lgtm /hold in case you wanted other eyes, unhold at will

[thockin]

/unhold