Merge branch '3.4' into 4.2

* 3.4: Added some missing info in the article about container params in routes

Author: OskarStark

routing/service_container_parameters.rst

@@ -162,6 +162,36 @@ path):
  ;
  };
 
+Now make sure that the ``app.route_prefix`` parameter is set somewhere in your
+container:
+
+.. configuration-block::
+
+ .. code-block:: yaml
+
+ # app/config/config.yml
+ parameters:
+ app.route_prefix: 'foo'
+
+ .. code-block:: xml
+
+ <!-- app/config/config.xml -->
+ <?xml version="1.0" charset="UTF-8" ?>
+ <container xmlns="http://symfony.com/schema/dic/services"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://symfony.com/schema/dic/services
+ https://symfony.com/schema/dic/services/services-1.0.xsd">
+
+ <parameters>
+ <parameter key="app.route_prefix">foo</parameter>
+ </parameters>
+ </container>
+
+ .. code-block:: php
+
+ // app/config/config.php
+ $container->setParameter('app.route_prefix', 'foo');
+
 .. note::
 
  Just like in normal service container configuration files, if you actually