Fix comment for query

Author: thompol

install/sql/incremental/upd_dev_collection.sql

@@ -4,5 +4,5 @@ ALTER TABLE `web_domain` DROP COLUMN `fastcgi_php_version`;
 -- add php_fpm_socket_dir column to server_php
 ALTER TABLE `server_php` ADD `php_fpm_socket_dir` varchar(255) DEFAULT NULL AFTER `php_fpm_pool_dir`;
 
--- rename Comodo to "Sectigo / Comodo CA"
+-- fix #5939
 UPDATE `ftp_user` SET `expires` = NULL WHERE `expires` = '0000-00-00 00:00:00';