[Sync EN] Clarify intval() behavior with scientific notation numeric strings (#5098)

[github-actions]

Commit: https://github.com/php/doc-en/commit/6197a68b1e9bc777323fa0df01adbed4d0c743f4
PR: https://github.com/php/doc-en/pull/5098

Fichiers FR à mettre à jour

• reference/var/functions/intval.xml