fixed typo in driver class name in documentation (#717)

Author: driehle

docs/en/configuration.rst

@@ -142,7 +142,7 @@ See also `this blog article <https://blog.tomhanderson.com/2016/03/zf2-doctrine-
         'doctrine' => [
             'connection' => [
                 'orm_crawler' => [
-                    'driverClass'   => \Doctrine\DBAL\Driver\PDO\MySql\Driver::class,
+                    'driverClass'   => \Doctrine\DBAL\Driver\PDO\MySQL\Driver::class,
                     'eventmanager'  => 'orm_crawler',
                     'configuration' => 'orm_crawler',
                     'params'        => [

docs/en/user-guide.rst

@@ -65,7 +65,7 @@ Connection parameters can be defined in the application configuration:
            'connection' => [
                // default connection name
                'orm_default' => [
-                   'driverClass' => \Doctrine\DBAL\Driver\PDO\MySql\Driver::class,
+                   'driverClass' => \Doctrine\DBAL\Driver\PDO\MySQL\Driver::class,
                    'params' => [
                        'host'     => 'localhost',
                        'port'     => '3306',