Update session/configuring_ttl.rst

Co-authored-by: Alexis Lefebvre <alexislefebvre@users.noreply.github.com>

Author: Seldaek

session/configuring_ttl.rst

@@ -112,7 +112,7 @@ The callback will be called right before the session is written.
             ->args([
                 service('Redis'),
                 ['ttl' => closure(service('my.ttl.handler'))],
-            ])
+            ]);
 
         $services
             // some class with an __invoke() method