docs(faq): #477 — fix auto_cancel config key typo

[Nathan Schram (nathanschram)]

Summary

• docs/faq/faq.md cost-budget example referenced a non-existent key auto_cancel_on_exceed
• The canonical key is auto_cancel (verified against settings.py:222 and docs/how-to/cost-budgets.md)
• Users copy-pasting the FAQ snippet would hit a Pydantic extra="forbid" parse error

This is the last Untether-side gap on #477 before closing it.

Test plan

• Verified key against CostBudgetSettings in src/untether/settings.py
• Verified against canonical docs/how-to/cost-budgets.md snippet
• No other files in the repo reference auto_cancel_on_exceed

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