Update some links to security docs

Author: javiereguiluz

symfony/security-bundle/5.3/config/packages/security.yaml

@@ -1,10 +1,9 @@
 security:
-    # https://symfony.com/doc/current/security/authenticator_manager.html
     enable_authenticator_manager: true
-    # https://symfony.com/doc/current/security.html#c-hashing-passwords
+    # https://symfony.com/doc/current/security.html#registering-the-user-hashing-passwords
     password_hashers:
         Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface: 'auto'
-    # https://symfony.com/doc/current/security.html#where-do-users-come-from-user-providers
+    # https://symfony.com/doc/current/security.html#loading-the-user-the-user-provider
     providers:
         users_in_memory: { memory: null }
     firewalls:
@@ -16,7 +15,7 @@ security:
             provider: users_in_memory
 
             # activate different ways to authenticate
-            # https://symfony.com/doc/current/security.html#firewalls-authentication
+            # https://symfony.com/doc/current/security.html#the-firewall
 
             # https://symfony.com/doc/current/security/impersonating_user.html
             # switch_user: true