Below phtml returns comma separated values from [‘code’]
How could I change the comma to a line break? 
<?php foreach ($_additional as $_data): ?>
    <tr>
        <th class="col label" scope="row"><?= $block->escapeHtml(__($_data['label'])) ?></th>
        <td class="col data" data-th="<?= $block->escapeHtml(__($_data['label'])) ?>"><?= /* @escapeNotVerified */ 
        $_helper->productAttribute($_product, $_data['value'], $_data['code'])
        ?>
        </td>
    </tr>
<?php endforeach; ?>
 
    
', $_data['code'])`? – Barmar Jun 29 '19 at 01:02
', $_data['code'])) – Shaun Jun 29 '19 at 01:46