DB: Fixed comments in character_banned table

Closes #1273

sql/base/characters_database.sql

@@ -434,7 +434,7 @@ DROP TABLE IF EXISTS `character_banned`;
 /*!40101 SET @saved_cs_client     = @@character_set_client */;
 /*!40101 SET character_set_client = utf8 */;
 CREATE TABLE `character_banned` (
-  `guid` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Account id',
+  `guid` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Global Unique Identifier',
   `bandate` int(10) unsigned NOT NULL DEFAULT '0',
   `unbandate` int(10) unsigned NOT NULL DEFAULT '0',
   `bannedby` varchar(50) NOT NULL,