[Sync EN] fiber/throw.xml Add an example (#4514)

[github-actions]

Commit: https://github.com/php/doc-en/commit/b3a0b9924ba577a3abf246c1bd1a6cf5c4bf14dc
PR: https://github.com/php/doc-en/pull/4514

Archivos ES a actualizar

• language/predefined/fiber/throw.xml