Fix broken links (Devin)

[github-actions]

@devin-ai-integration Please fix the broken links detected by the scheduled link checker.

Instructions:

1. For each URL listed below, 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   • Updating outdated commit SHAs to the latest commit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, then post a comment to the PR mentioning that you have tested it using the preview link
8. When the PR is ready for review, request a review from @davidkonigsberg in GitHub and send a message in the Devin session that includes "<!here>" to alert everyone in the channel.
9. Delete the scaffold file (.github/broken-links/broken-links.md) as part of your fix

Broken Links:

Non-429 Broken Links

• [404] https://buildwithfern.com/contact
• [404] https://buildwithfern.com/contact
• [404] https://buildwithfern.com/slack
• [404] https://buildwithfern.com/slack

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View workflow run

[devin-ai-integration]

/contact links — fixed ✓

All https://buildwithfern.com/contact links (7 EN files + 6 zh translations) have been replaced with https://buildwithfern.com/book-demo, which returns 200 and matches the navbar "Book a demo" link in docs.yml.

/slack links — needs manual validation

https://buildwithfern.com/slack returns 404 on the marketing site. This URL is used as a stable redirect to the Fern Community Slack invite in:

• fern/products/home/pages/welcome.mdx (lines 337, 442)
• fern/components/FernFooter.tsx (line 464)
• zh translation: fern/translations/zh/products/home/pages/welcome.mdx

I could not find a reliable replacement — Slack shared-invite links expire, and the marketing site itself (buildwithfern.com) also uses /slack as the canonical redirect URL (as does the fern GitHub README). The fix likely needs to happen on the marketing site by restoring the /slack → Slack invite redirect. Leaving these links unchanged per the PR instructions.

[github-actions]

🚫 [vale] _{reported by reviewdog 🐶}
[Microsoft.Contractions] Use 'isn't' instead of 'is not'.

[github-actions]

🌿 Preview your docs: https://fern-preview-devin-fix-broken-links.docs.buildwithfern.com/learn

Here are the markdown pages you've updated:

• learn/docs/api-references/generate-graphql-ref
• learn/docs/authentication/setup/sso
• learn/docs/getting-started/quickstart
• learn/docs/configuration/site-level-settings
• learn/sdks/overview/autorelease
• learn/sdks/generators/python/quickstart

[devin-ai-integration]

Verified via the preview deployment that all updated pages render correctly:

• https://fern-preview-devin-fix-broken-links.docs.buildwithfern.com/learn/docs/getting-started/quickstart
• https://fern-preview-devin-fix-broken-links.docs.buildwithfern.com/learn/sdks/overview/autorelease
• https://fern-preview-devin-fix-broken-links.docs.buildwithfern.com/learn/docs/authentication/setup/sso
• https://fern-preview-devin-fix-broken-links.docs.buildwithfern.com/learn/docs/api-references/generate-graphql-ref
• https://fern-preview-devin-fix-broken-links.docs.buildwithfern.com/learn/sdks/generators/python/quickstart
• https://fern-preview-devin-fix-broken-links.docs.buildwithfern.com/learn/docs/configuration/site-level-settings

Replacement URL https://buildwithfern.com/book-demo returns 200.

Re: the Vale Microsoft.Contractions flag on generate-graphql-ref.mdx — the "is not" wording is pre-existing; this PR only changed the URL within that line.