chore: Update symfony docs (#1528)

Author: HazAT

src/_data/platforms.yml

@@ -550,11 +550,11 @@
       slug: symfony2
       support_level: production
       type: framework
-      name: Symfony2
-      doc_link: /clients/php/integrations/symfony2/
+      name: Symfony
+      doc_link: /platforms/php/symfony/
       wizard_parent: php
       wizard:
-        - _documentation/clients/php/integrations.md#symfony2
+        -  _documentation/platforms/php/symfony.md
 -
       slug: ruby
       support_level: production