[Sync EN] ext/intl: Add missing space (#5759)

[github-actions]

Commit: https://github.com/php/doc-en/commit/a03f9eda2d45b725f75b4d6a1a22e8aec63e157a
PR: https://github.com/php/doc-en/pull/5759

Archivos ES a actualizar

• reference/intl/book.xml