docs: update links for Credentials-based Authentication

[Kinfe123]

☕️ Reasoning

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
auth-docs	Ready	Preview	Comment	Sep 28, 2025 6:51am

1 Skipped Deployment

Project	Deployment	Preview	Comments	Updated (UTC)
next-auth-docs	Ignored	Preview		Sep 28, 2025 6:51am

[vercel]

@Kinfe123 is attempting to deploy a commit to the authjs Team on Vercel.

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[github-actions]

Broken Link Checker

1 broken links found. Links organised below by source page, or page where they were found.

1) /getting-started/migrate-to-better-auth

Target Link	Link Text
/docs	"documentation"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.70%. Comparing base (4b7c843) to head (06650c3).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main   #13258       +/-   ##
===========================================
+ Coverage   38.92%   59.70%   +20.78%     
===========================================
  Files         130      111       -19     
  Lines        4229     1648     -2581     
  Branches      311      233       -78     
===========================================
- Hits         1646      984      -662     
+ Misses       2583      664     -1919     

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