How to Hide the "Fatal Error Notify" Admin Menu

function plt_hide_fatal_error_notify_menus() {
	//Hide the "Settings → Fatal Error Notify" menu.
	remove_submenu_page('options-general.php', 'fatal-error-notify');
}

add_action('admin_menu', 'plt_hide_fatal_error_notify_menus', 11);

Where do I put this code?