fix: add warning to retry target to avoid incorrect usage (#543)

* fix: add warning to retry target to avoid incorrect use

* fix: add comment for predicate

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

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Co-authored-by: omair <omairn@google.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
2 files changed