Add warning about incompleteness of OpenAPI schemas to kubernetes-api.md

[adriankarasinski]

Updated kubernetes-api.md - Added short warning about possible incompleteness of OpenAPI schemas

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[sftim]

Thanks.

We don't start note callouts with "Please note"; also I think kubectl <subcommand> dry-run … is deprecated without specifying what kind of dry run.

[sftim]

I think this is correct, and it's more aligned with our style guide (edited)

Suggested change

	Please note the validation rules within OpenAPI schemas are incomplete and additional validation occurs in the code of the kube-apiserver. If precise and complete verification is required, a `kubectl apply --dry-run` runs all the applicable validation.
	The validation rules published as part of OpenAPI schemas may not be complete, and usually aren't.
	Additional validation occurs within the API server. If you want precise and complete verification,
	a `kubectl apply --dry-run=server` runs all the applicable validation (and also activates admission-time
	checks).

[deads2k]

Tim's suggestion is correct on the technical details. Thanks.