default validation mapping directory

Author: zairigimad

reference/configuration/framework.rst

@@ -2196,7 +2196,7 @@ mapping
 paths
 """""
 
-**type**: ``array`` **default**: ``[]``
+**type**: ``array`` **default**: ``['config/validation/']``
 
 This option allows to define an array of paths with files or directories where
 the component will look for additional validation files:
@@ -2210,7 +2210,7 @@ the component will look for additional validation files:
             validation:
                 mapping:
                     paths:
-                        - "%kernel.project_dir%/validation/"
+                        - "%kernel.project_dir%/config/validation/"
 
     .. code-block:: xml