Update 02-error-handling.md

[mironov-artem]

Contributor checklist

Leave anything that you believe does not apply unchecked.

• I accept the AI Policy, or AI was not used in the creation of this PR.
• Bug fixes include regression tests
• Chores
• Documentation changes
• Features include unit/acceptance tests
• Refactoring
• Update dependencies

[jimsynz]

Thanks for this one too, @mironov-artem — returning {:retry, reason} from compensate/4 would have worked around the issue. We've gone with fixing the root cause in the executor instead (#306), so that backoff/4 always receives the unwrapped error regardless of whether compensate/4 returns bare :retry or {:retry, reason}. Appreciate the contribution!