[Sync EN] reflection: Delete outdated paragraph in hasreturntype.xml (#5610)

[github-actions]

Commit: https://github.com/php/doc-en/commit/c3485c8f1c57caa8ea0fc2924050a175bbc7686d
PR: https://github.com/php/doc-en/pull/5610

Neue EN-Dateien (noch nicht übersetzt)

• reference/reflection/reflectionfunctionabstract/hasreturntype.xml