ci: correct owned rescue token-route explanation
Correct the owned-pool rescue polling allowlist explanation after #34787: Actions reads and mutations now share the existing cmux-bot token with github.token fallback, and never use the runner-routing App. This completes the feature-branch half of #34811; the default-branch copy follows its token-route carry.
Leo asked: “how's ci? we still have bigger wins we can get? what's the state of it all? more things we can skip/do better”.
Validation: parsed the Python source successfully. The only change is one explanatory string; behavior and allowlist matching stay unchanged.
Prior art: #30608, #25929, #25204 and #25812 read. The held nightly-capture PR touches a separate allowlist entry.
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Summary by cubic
Corrects the owned-pool rescue allowlist explanation to match the token routing from #34787: reads and mutations now use the existing cmux-bot token with github.token fallback, and the routing App token is never used. This is a comment-only change in the test file; behavior is unchanged.