[Sync EN] Fix localeconv() function description (#5707)

[github-actions]

Commit: https://github.com/php/doc-en/commit/92367aee7c51055f62de8c85851ba57aaf3cce7c
PR: https://github.com/php/doc-en/pull/5707

Archivos ES a actualizar

• reference/strings/functions/localeconv.xml