Documentation: Add Seeed Studio XIAO ESP32S3 Board

[rcsim]

Summary

This commit adds the documentation for the Seeed Studio XIAO ESP32S3 board. It includes examples for GPIOs and user LEDs.

Impact

Is new feature added? Is existing feature changed? NO
Impact on user (will user need to adapt to change)? NO
Impact on build (will build process change)? NO / NO
Impact on hardware (will arch(s) / board(s) / driver(s) change)? NO
Impact on documentation (is update required / provided)? Yes, this PR adds documentation for Seeed Studio XIAO ESP32S3.
Impact on security (any sort of implications)? NO
Impact on compatibility (backward/forward/interoperability)? NO

Testing

Build the documentation and check the output on browser:

cd Documentation/
pipenv shell
make html
...
copying static files... done
copying extra files... done
dumping search index in English (code: en)... done
dumping object inventory... done
build succeeded.

[nuttxpr]

[Experimental Bot, please feedback here]

Yes, this PR appears to meet the NuttX requirements. The summary is clear, the impact assessment is thorough, and the testing, while simple, is appropriate for a documentation change. The before/after logs aren't strictly necessary for documentation and demonstrating successful documentation build is sufficient.