[Sync EN] Document #[\NoDiscard] behavior on interface, abstract, and overriding methods (#5618)

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Commit: https://github.com/php/doc-en/commit/e7f89579e2abcecad5a62dd96f11a4926df62e13
PR: https://github.com/php/doc-en/pull/5618

Zu aktualisierende DE-Dateien

• language/predefined/attributes/nodiscard.xml