How to Hide Web Accessibility Toolkit - ARIA Labels & Roles for WCAG & ADA Compliance Admin Menus

function plt_hide_aria_accessibility_toolkit_menus() {
	//Hide the "Web Accessibility" menu.
	remove_menu_page('ariaat');
	//Hide the "Settings → Web Accessibility" menu.
	remove_submenu_page('options-general.php', 'ariaat-legacy');
}

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

Where do I put this code?