README: Update BR link

[dveeden]

Summary by CodeRabbit

• Documentation
  • Corrected project link reference in README to point to the updated project path.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The README.md file was updated to correct the project link reference for BR under the "Used By" section. The link path was changed from a direct repository reference to a specific tree path within the TiDB repository structure.

Changes

Cohort / File(s)	Summary
Documentation Link Update README.md	Corrected BR project URL from pingcap/br to pingcap/tidb/tree/master/br in the "Used By" section

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A path was askew, but now it's set right,
The BR link shines with corrected light,
Through tidb's tree it now guides the way,
With documentation crystal-clear today! 📚✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'README: Update BR link' directly and accurately summarizes the main change - updating a BR project link in the README documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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