Typo in user guide documentation

[ch-feedbackpeople]

I smashed my brain why the example given in the user guide under "Connection settings" didn't work in my environment, I always got a "driver class could not be found" exception. After an hour of debugging it turns out just to be a typo.

'driverClass' => \Doctrine\DBAL\Driver\PDO\MySql\Driver::class,

should be

'driverClass' => \Doctrine\DBAL\Driver\PDO\MySQL\Driver::class,

"MySQL" instead of "MySql"

[greg0ire]

Please send a pull request