Retrieve the HTML link to the URL of the author of the current comment.
Both get_comment_author_url() and get_comment_author() rely on get_comment(), which falls back to the global comment variable if the $comment_ID argument is empty.
<?php apply_filters( 'get_comment_author_link', $return ); ?>
Added to your child themes functions.php file, you can modify the HTML link to the URL of the author of the current comment.
get_comment_author_link is located in wp-includes/comment-template.php