fix documentation fos_user.from_email.sender_name

changed to correct default value

Author: toaotc

Resources/doc/configuration_reference.md

@@ -14,7 +14,7 @@ fos_user:
     model_manager_name:     null  # change it to the name of your entity/document manager if you don't want to use the default one.
     from_email:
         address:        [email protected]
-        sender_name:    Admin
+        sender_name:    webmaster
     profile:
         form:
             type:               fos_user_profile