Customize comment heading

gistfile1.php

<?php
/**
 * Custom comment heading
 *
 * @since 1.0.0
 * @param string $title 
 * @return string
 */
function ja_comment_heading( $title ) {
	return '<h3><strong>' . get_comments_number() . ' Responses to</strong> ' . get_the_title() . '</h3>';
}
add_filter( 'genesis_title_comments', 'ja_comment_heading' );