Fix Trunk link in GPUI examples documentation (#64192)

## Summary

- Replace the outdated Trunk URL in the GPUI examples README with
https://trunk-rs.github.io/trunk/.

## Verification

- Confirmed the replacement URL returns HTTP 200.
- Ran `git diff --check` successfully.
- No code tests needed for this documentation-only link change.

Release Notes:

- N/A
d62802d456Max Brunsfeld committed on 9/14/2026, 4:38:51 PM· committed by GitHubparent47b8ea5
1 file changedLine totals unavailable