Removes a top-level admin menu.

Example usage:

– `remove_menu_page( ‘tools.php’ )`
– `remove_menu_page( ‘plugin_menu_slug’ )`

function remove_menu_page( $menu_slug ) {
	global $menu;

	foreach ( $menu as $i => $item ) {
		if ( $menu_slug === $item[2] ) {
			unset( $menu[ $i ] );
			return $item;
		}
	}

	return false;
}