minor #19398 [Config] Update configuration.rst for example config builder ide helper (chadyred)

This PR was submitted for the 7.1 branch but it was merged into the 6.3 branch instead.

Discussion
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[Config] Update configuration.rst for example config builder ide helper

Hello,

I updated the example of the "how to help IDE with bundle configuration", it seems to be just a little bit old

Commits
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fc79c88 doc: Update configuration.rst

Author: javiereguiluz

configuration.rst

@@ -1287,14 +1287,14 @@ namespace ``Symfony\Config``::
         $security->firewall('main')
             ->pattern('^/*')
             ->lazy(true)
-            ->anonymous();
+            ->security(false);
 
         $security
             ->roleHierarchy('ROLE_ADMIN', ['ROLE_USER'])
             ->roleHierarchy('ROLE_SUPER_ADMIN', ['ROLE_ADMIN', 'ROLE_ALLOWED_TO_SWITCH'])
             ->accessControl()
                 ->path('^/user')
-                ->role('ROLE_USER');
+                ->roles('ROLE_USER');
 
         $security->accessControl(['path' => '^/admin', 'roles' => 'ROLE_ADMIN']);
     };