update grant command to match how mysql shows

When looking up the granted permissions for users in MySQL using `show grants for 'git'@'localhost';` it shows the permissions in this order regardless of how you enter them. Changing so that comparing your actual permissions vs. what installation guide says is easier.

doc/install/database_mysql.md

@@ -36,7 +36,7 @@ We do not recommend using MySQL due to various issues. For example, case [(in)se
     mysql> CREATE DATABASE IF NOT EXISTS `gitlabhq_production` DEFAULT CHARACTER SET `utf8` COLLATE `utf8_unicode_ci`;
 
     # Grant the GitLab user necessary permissions on the table.
-    mysql> GRANT SELECT, LOCK TABLES, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER ON `gitlabhq_production`.* TO 'git'@'localhost';
+    mysql> GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP, INDEX, ALTER, LOCK TABLES ON `gitlabhq_production`.* TO 'git'@'localhost';
 
     # Quit the database session
     mysql> \q