fix: correct API Extension documentation link

[Milad93R]

Summary

• Fixes the broken documentation link on the API Extension settings page
• The old link /guides/extension/api-based-extension/README was redirecting to an unrelated getting-started page
• Updated to point to the correct documentation URL

Fixes #30946

Test plan

• Navigate to Settings > API Extension
• Click "Learn how to develop your own API Extension" link
• Verify it opens the correct API-based extension documentation page

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello @Milad93R, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical user experience issue by correcting an outdated and broken documentation link within the API Extension settings. The change ensures that users seeking information on developing API Extensions are directed to the appropriate and helpful resources, thereby improving the overall usability and support for this feature.

Highlights

• Documentation Link Fix: The pull request resolves a broken documentation link found on the API Extension settings page.
• Incorrect Redirection: The previous link, /guides/extension/api-based-extension/README, was incorrectly redirecting users to an unrelated 'getting-started' page.
• Updated URL: The documentation link has been updated to point to the correct and relevant API-based extension documentation URL.

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[gemini-code-assist]

Code Review

This pull request fixes a broken documentation link for API Extensions. The fix involves hardcoding the new URL. While this corrects the link, it removes the existing internationalization support, as the URL will now always point to the English documentation. My review includes a suggestion to update the usage of the useDocLink hook to fix the link while preserving localization, which is a more robust solution.