Display description on each child product in a Mix and Match container

wc-mnm-display-description.php

<?php
/**
 * Display individual MNM option descriptions
 * 
 * @param obj $mnm_item WC_Product of child item
 * @param obj WC_Mix_and_Match $product the parent container
 */
function kia_add_individual_info( $mnm_item, $parent_product ) {
	echo '<p class="desc">' . $mnm_item->get_short_description() . '</p>';
}
add_action( 'woocommerce_mnm_child_item_details', 'kia_add_individual_info', 65, 2 );