Fix incorrect PHP example to exclude HTTP code with Monolog

Author: ker0x

logging/monolog_exclude_http_codes.rst

@@ -52,12 +52,14 @@ logging these HTTP codes based on the MonologBundle configuration:
         use Symfony\Config\MonologConfig;
 
         return static function (MonologConfig $monolog) {
-            $monolog->handler('main')
+            $mainHandler = $monolog->handler('main')
                 // ...
                 ->type('fingers_crossed')
                 ->handler(...)
-                ->excludedHttpCode([403, 404])
             ;
+
+            $mainHandler->excludedHttpCode()->code(403);
+            $mainHandler->excludedHttpCode()->code(404);
         };
 
 .. caution::