Media: Fix return type annotation for block_core_image_get_lightbox_settings()
#9393
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Trac ticket: https://core.trac.wordpress.org/ticket/63790
This PR fixes the incorrect
@returnannotation inblock_core_image_get_lightbox_settings().The function can return
nullwhen lightbox settings are not found, but the DocBlock only documentsarrayas the return type. This PR updates the annotation to@return array|nullto accurately reflect the actual return behavior.