[Sync EN] array-merge.xml Amend the code examples (#5621)

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Commit: https://github.com/php/doc-en/commit/52209b319aabbecad59f887b6dff3fb15156f1ff
PR: https://github.com/php/doc-en/pull/5621

Zu aktualisierende DE-Dateien

• reference/array/functions/array-merge.xml