docs(webhooks): document event listing methods

[gabrielmfern]

Summary

• document the synchronous webhook event APIs
• document the asynchronous webhook event APIs

Testing

• uvx --from tox tox -e lint,mypy,py

Linear: https://linear.app/resend/issue/DEV-1926

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Summary by cubic

Adds docstrings to the sync and async webhook event methods (list_events, get_event, list_event_attempts) so the API reference is complete. This is a docs-only change; no behavior changes or migrations required. Addresses DEV-1926.

^{Written for commit 3ee1a24. Summary will update on new commits.}

[klotty]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Auto-approved: Adds docstrings to sync/async webhook event methods. Purely additive documentation with no behavior or signature changes visible in the diff; a docs-only change needs no human tradeoff decision.

Re-trigger cubic</sub>