document broken usage for vars

[Liujingfang1]

vars was introduced to fetch value from one object config and inject it to another object config. It's not aiming for the general substitution or templating. vars is broken for use cases, as listed in #2052. We should also document those cases in kustomize documents.

[tkellen]

Can we accomplish this with a deprecation warning as suggested in #2052 (comment)?

[Liujingfang1]

We can first document the broken use cases. Once we confirmed that vars is to be deprecated, we can add the deprecation message.

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

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