Fixed some config file paths for Flex and Symfony 4

Author: javiereguiluz

controller/argument_value_resolver.rst

@@ -71,14 +71,15 @@ type-hinted method arguments:
 
     .. code-block:: yaml
 
-        # app/config/config.yml
+        # config/packages/sensio_framework_extra.yaml
         sensio_framework_extra:
             request:
                 converters: true
                 auto_convert: false
 
     .. code-block:: xml
 
+        <!-- config/packages/sensio_framework_extra.xml -->
         <sensio-framework-extra:config>
             <request converters="true" auto-convert="true" />
         </sensio-framework-extra:config>

reference/configuration/security.rst

@@ -589,7 +589,7 @@ Using the BCrypt Password Encoder
 
     .. code-block:: php
 
-        // app/config/security.php
+        // config/packages/security.php
         use Symfony\Component\Security\Core\User\User;
 
         $container->loadFromExtension('security', array(
@@ -645,7 +645,7 @@ Using the Argon2i Password Encoder
 
     .. code-block:: yaml
 
-        # app/config/security.yml
+        # config/packages/security.yaml
         security:
             # ...
 
@@ -658,7 +658,7 @@ Using the Argon2i Password Encoder
 
     .. code-block:: xml
 
-        <!-- app/config/security.xml -->
+        <!-- config/packages/security.xml -->
         <config>
             <!-- ... -->
             <encoder