WordPress at a glance
function is not described

media_post_single_attachment_fields_to_edit() WP 2.8.0

Retrieves the post non-image attachment fields to edito form fields.

No Hooks.

Return

Array. Filtered attachment form fields.

Usage

media_post_single_attachment_fields_to_edit( $form_fields, $post );
$form_fields(array) (required)
An array of attachment form fields.
$post(WP_Post) (required)
The WP_Post attachment object.

Code of media post single attachment fields to edit: wp-admin/includes/media.php VER 5.0.3

<?php
function media_post_single_attachment_fields_to_edit( $form_fields, $post ) {
	unset($form_fields['image_url']);
	return $form_fields;
}