Fix link to the PHP extension (#25144)

Fix broken links to [PHP
extensions](https://github.com/zed-extensions/php) from [the
documentation](https://zed.dev/docs/languages/php).

Release Notes:

- N/A
d4414efd6fUSAMI Kenta committed on 2/19/2025, 11:10:10 AM· committed by GitHubparent2274e88
1 file changedLine totals unavailable