[Sync EN] Fix collator.setattribute example (#5503)

[github-actions]

Commit: https://github.com/php/doc-en/commit/0194deb3cec8d79ae6b13700f3cd031d14597838
PR: https://github.com/php/doc-en/pull/5503

Fichiers FR à mettre à jour

• reference/intl/collator/set-attribute.xml