DOCSP-39180: link to new symfony guide (#194)

Author: rustagir

source/languages/php.txt

@@ -66,7 +66,7 @@ retrieve objects, or use MongoDB as a data store.
 
    .. card::
       :headline: Symfony
-      :url: https://mongodb-developer.github.io/symfony-mongodb-rental-workshop/
+      :url: https://www.mongodb.com/docs/drivers/php-frameworks/symfony/
       :icon: /languages/images/symfony.png
       :icon-alt: Symfony logo