Fix sql changelog (tgstation#57972)

Fixed bad SQL that I originally wrote in the changelog for 5.11, anyone trying to update their schema from < 5.11 up would notice this.

SQL/database_changelog.txt

@@ -17,14 +17,15 @@ ALTER TABLE `messages` ADD `playtime` INT(11) NULL DEFAULT(NULL) AFTER `severity
 
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-Version 5.11, 7 September 2020, by bobbahbrown, MrStonedOne, and Jordie0608
+Version 5.11, 7 September 2020, by bobbahbrown, MrStonedOne, and Jordie0608 (Updated 26 March 2021 by bobbahbrown)
 
 Adds indices to support search operations on the adminhelp ticket tables. This is to support improved performance on Atlanta Ned's Statbus.
 
-CREATE INDEX `idx_ticket_act_recip` (`action`, `recipient`)
-CREATE INDEX `idx_ticket_act_send` (`action`, `sender`)
-CREATE INDEX `idx_ticket_tic_rid` (`ticket`, `round_id`)
-CREATE INDEX `idx_ticket_act_time_rid` (`action`, `timestamp`, `round_id`)
+ALTER TABLE `ticket`
+	ADD INDEX `idx_ticket_act_recip` (`action`, `recipient`),
+	ADD INDEX `idx_ticket_act_send` (`action`, `sender`),
+	ADD INDEX `idx_ticket_tic_rid` (`ticket`, `round_id`),
+	ADD INDEX `idx_ticket_act_time_rid` (`action`, `timestamp`, `round_id`);
 
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