DB/Creature: Fix of Doc Mixilpixil gossips

By Malcrom, closes #12617

sql/updates/world/2014_07_24_02_world_gossip.sql

@@ -0,0 +1,4 @@
+-- Missing Gossip for Doc Mixilpixil
+UPDATE `creature_template` SET `gossip_menu_id`=5763 WHERE `entry`=7207;
+DELETE FROM `gossip_menu` WHERE `entry`=5763;
+INSERT INTO `gossip_menu` (`entry`,`text_id`) VALUES (5763,6948);