javascript from child theme

Hello,

I copied and modified js/maps.js

But when in theme-child/js.maps.js it don’t make any difference.

I was reading that i have to insert this code into theme-child/functions.php

add_action('wp_enqueue_scripts', 'load_javascript_files');
function load_javascript_files() {
	wp_register_script('ajax_call_mkto', get_template_directory_uri() . 'js/marketo_wp_ajax.js', array('jquery'), true );
	wp_enqueue_script('ajax_call_mkto');
}

can someone offer some help ?

thank you