docs: add a comment on dynamic example

[PascalBourdier]

the error message is hard to understand/debug because the "kind" line contains "Deployment" just below

Sorry, we do not accept changes directly against this repository, unless the change is to the README.md itself. Please see CONTRIBUTING.md for information on where and how to contribute instead.

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[k8s-ci-robot]

Hi @PascalBourdier. Thanks for your PR.

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