typo

Author: OskarStark

components/http_foundation/sessions.rst

@@ -233,7 +233,7 @@ the array::
     $tokens['c'] = $value;
     $session->set('tokens', $tokens);
 
-With structured namespacing, the key can be translated to the array
+With structured namespacing, they key can be translated to the array
 structure like this using a namespace character (which defaults to ``/``)::
 
     // ...