[refactor] Readme

README.md

@@ -126,10 +126,10 @@ You can use MongoDB either as the main database, either as a side database. To d
     'username' => env('DB_USERNAME', 'homestead'),
     'password' => env('DB_PASSWORD', 'secret'),
     'options' => [
-        'database' => 'admin', // required with Mongo 3+
-
-        // here you can pass more settings
-        // see https://www.php.net/manual/en/mongodb-driver-manager.construct.php under "Uri Options" for a list of complete parameters you can use
+        // here you can pass more settings to the Mongo Driver Manager
+        // see https://www.php.net/manual/en/mongodb-driver-manager.construct.php under "Uri Options" for a list of complete parameters that you can use
+
+        'authSource' => env('DB_AUTHENTICATION_DATABASE', 'admin'), // required with Mongo 3+
     ],
 ],
 ```