Document the fields.

Author: enricobattocchi

admin-functions.php

@@ -488,8 +488,8 @@ function duplicate_post_copy_attachments( $new_id, $post ) {
 		$cloned_child    = [
 			'ID'           => $new_attachment_id,
 			'post_title'   => $child->post_title,
-			'post_excerpt' => $child->post_excerpt,
-			'post_content' => $child->post_content,
+			'post_excerpt' => $child->post_excerpt, // Caption.
+			'post_content' => $child->post_content, // Description.
 			'post_author'  => $new_post_author->ID,
 		];
 		wp_update_post( wp_slash( $cloned_child ) );