[Sync EN] ext/reflection: Remove incorrect `null` in canbepassedbyvalue / gettraits(#5563)

[github-actions]

Commit: https://github.com/php/doc-en/commit/93906cd3b6cf8f7217503dba4d994a1ebd32d4ac
PR: https://github.com/php/doc-en/pull/5563

Fichiers FR à mettre à jour

• reference/reflection/reflectionclass/gettraits.xml
• reference/reflection/reflectionparameter/canbepassedbyvalue.xml