How to add additional content below the Single Product Short Description in Woocommerce

functions.php

<?php 
/**
* How to add text or other content below the Single Product Short Description in Woocommerce
*
* @author    Jordan Smith <jordan@hirejordansmith.com>
* @link      https://hirejordansmith.com
*/

// Basic Use Case
add_action( 'woocommerce_single_product_summary', 'hjs_below_single_product_summary', 20 );
function hjs_below_single_product_summary() {
    // Add Your Additional Content Here
}

// Real World Example using ACF to integrate a dynamic YouTube video id via custom field
add_action( 'woocommerce_single_product_summary', 'hjs_video_below_single_product_summary', 20 );
function hjs_video_below_single_product_summary() {
    $video_id = get_field('product_video_id'); ?>
    <div class="product-video">
        <a class="popup-youtube button" href="http://www.youtube.com/watch?v=<?php echo $video_id; ?>&amp;rel=0&amp;controls=0&amp;showinfo=0">Watch Video</a>
    </div>
<?php }

// Real World Example adding a shortcode below the Single Product Short Description
add_action( 'woocommerce_single_product_summary', 'hjs_shortcode_below_single_product_summary', 20 );
function hjs_shortcode_below_single_product_summary() {
    echo do_shortcode('[your_shortcode]');
}