[Sync EN] install/unix: Fix typos and update stale references in debian.xml (#5744)

[github-actions]

Commit: https://github.com/php/doc-en/commit/2d91caad93e275542dfdc1a99a6fc8a0ed030108
PR: https://github.com/php/doc-en/pull/5744

Archivos ES a actualizar

• install/unix/debian.xml