[Framework] Clarifying what base_path actually does

Page: https://symfony.com/doc/6.4/reference/configuration/framework.html#base-path

Author: ThomasLandauer

reference/configuration/framework.rst

@@ -2064,7 +2064,7 @@ base_path
 
 **type**: ``string``
 
-This option allows you to define a base path to be used for assets:
+This option allows you to define a base path from where Twig's ``{{ asset() }}`` function is resolved:
 
 .. configuration-block::