Custom Title for Related Posts Shortcode

Displaying a related posts through shortcode is very useful. But since I’m not familiar with programming, I can’t customize it. Here’s the code:

// Related Posts
function related_posts_shortcode( $atts ) {
extract(shortcode_atts(array(
'limit' => '5',
), $atts));

global $wpdb, $post, $table_prefix;

if ($post->ID) {
$retval = '
<ul>';

// Get tags
$tags = wp_get_post_tags($post->ID);
$tagsarray = array();

foreach ($tags as $tag) {
$tagsarray[] = $tag->term_id;
}
$tagslist = implode(',', $tagsarray);
// Do the query
$q = "
SELECT p.*, count(tr.object_id) as count
FROM $wpdb->term_taxonomy AS tt, $wpdb->term_relationships AS tr, $wpdb->posts AS p
WHERE tt.taxonomy ='post_tag'
AND tt.term_taxonomy_id = tr.term_taxonomy_id
AND tr.object_id = p.ID
AND tt.term_id IN ($tagslist)
AND p.ID != $post->ID
AND p.post_status = 'publish'
AND p.post_date_gmt < NOW()
GROUP BY tr.object_id
ORDER BY count DESC, p.post_date_gmt DESC
LIMIT $limit;";
$related = $wpdb->get_results($q);

if ( $related ) {
foreach($related as $r) {
$retval .= '
<li><a target="_blank" href="'.get_permalink($r->ID).'">'.wptexturize($r->post_title).'</a></li>';}
}
else {
$retval .= '<li>No related posts found</li>';
}
$retval .= '</ul>';
return $retval;
}
return;
}
add_shortcode('related_posts', 'related_posts_shortcode');

I didn’t make that code; I just copy and paste it from a tutorial.
Now, let’s say I added a “[related_posts] on my content.
Then, the 5 related posts displayed like this: (for example)
1.
2.
3.
4.
5.

Now what I want to do is this:

(Add title like related posts)
1.
2.
3.
4.
5.
(add more texts here)

Thanks.