[Security]: Simplifying the DEV firewall's pattern

Page: https://symfony.com/doc/6.4/security.html#the-firewall

Reasons:
* The inner parentheses `_(profiler|wdt)` are overly complicated
* AssetMapper recommends to have all assets under `/asset/`: https://symfony.com/doc/6.4/frontend/asset_mapper.html

Author: ThomasLandauer

Diff for: security.rst

@@ -497,7 +497,7 @@ will be able to authenticate (e.g. login form, API token, etc).
                 # the order in which firewalls are defined is very important, as the
                 # request will be handled by the first firewall whose pattern matches
                 dev:
-                    pattern: ^/(_(profiler|wdt)|css|images|js)/
+                    pattern: ^/(_profiler|_wdt|assets)/
                     security: false
                 # a firewall with no pattern should be defined last because it will match all requests
                 main:
@@ -529,7 +529,7 @@ will be able to authenticate (e.g. login form, API token, etc).
                 <!-- the order in which firewalls are defined is very important, as the
                      request will be handled by the first firewall whose pattern matches -->
                 <firewall name="dev"
-                    pattern="^/(_(profiler|wdt)|css|images|js)/"
+                    pattern="^/(_profiler|_wdt|assets)/"
                     security="false"/>
 
                 <!-- a firewall with no pattern should be defined last because it will match all requests -->
@@ -555,7 +555,7 @@ will be able to authenticate (e.g. login form, API token, etc).
             // the order in which firewalls are defined is very important, as the
             // request will be handled by the first firewall whose pattern matches
             $security->firewall('dev')
-                ->pattern('^/(_(profiler|wdt)|css|images|js)/')
+                ->pattern('^/(_profiler|_wdt|assets)/')
                 ->security(false)
             ;
 
@@ -598,9 +598,7 @@ don't accidentally block Symfony's dev tools - which live under URLs like
                         pattern:
                             - ^/_profiler/
                             - ^/_wdt/
-                            - ^/css/
-                            - ^/images/
-                            - ^/js/
+                            - ^/assets/
             # ...
 
         .. code-block:: php