fix: broken links detected by daily link checker

[github-actions]

Broken Links Detected

The daily link checker found broken links in the documentation that need to be fixed.

Instructions for @fern Writer

1. For each URL listed in .github/broken-links/broken-links.md, identify the source file containing the broken link
2. Try to find the correct replacement URL. Common fixes include:
   • Updating outdated commit SHAs to the latest commit
   • Fixing URL-encoded paths
   • Updating renamed file paths
3. IMPORTANT: If you cannot confidently find a correct replacement (e.g., the only signal is a 5xx/503 error, connection reset, or rate limiting), do NOT remove or modify the link. Instead, leave it unchanged and add a PR comment on the relevant line asking for manual validation.
4. Only update links/paths contained in this PR, not other links that follow a similar pattern
5. Run fern docs dev locally to verify your changes don't break anything
6. Push your fix to this PR branch
7. After CI posts a preview link, use it to verify that your changes actually fix the underlying issue
8. Delete the scaffold file (.github/broken-links/broken-links.md) as part of your fix

Broken Links Report

See .github/broken-links/broken-links.md for the full report.

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🌿 Preview

https://signalwire-preview-970d456d-3fa3-4005-b04e-0a15afbce302.docs.buildwithfern.com/docs

✅ All links are valid.

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