Fix commit suggested by someone :)

Author: smnandre

ux.symfony.com/src/Service/CookbookFactory.php

@@ -68,7 +68,7 @@ private function getConverter(): MarkdownConverter
             $environment->addExtension(new CommonMarkCoreExtension());
             $environment->addExtension(new FrontMatterExtension());
 
-            $this->converter = new MarkdownConverter($environment)
+            $this->converter = new MarkdownConverter($environment);
         }
 
         return $this->converter;