how can I add alt tags to thw post tags?

I found this in the wp-includes/category-template.php, but I am not the best at php. I want to add alt=”<tag word>” and have the alt tag be the same text as the WordPress tag word itself.

/**
* Display the terms in a list.
*
* @since 2.5.0
*
* @param int $id Post ID.
* @param string $taxonomy Taxonomy name.
* @param string $before Optional. Before list.
* @param string $sep Optional. Separate items using this.
* @param string $after Optional. After list.
* @return null|bool False on WordPress error. Returns null when displaying.
*/
function the_terms( $id = 0, $taxonomy, $before = ”, $sep = ‘, ‘, $after = ” ) {
$term_list = get_the_term_list( $id, $taxonomy, $before, $sep, $after );

if ( is_wp_error( $term_list ) )
return false;

echo apply_filters(‘the_terms’, $term_list, $taxonomy, $before, $sep, $after);
}