Fixed documentation around generating absolute URLs with Symfony (#336)

Co-authored-by: Yann Eugoné <yeugone@prestaconcept.net>

doc/2-configuration.md

@@ -64,15 +64,15 @@ you have to set the base URL of where you sitemap files will be accessible. The
 of the URL will also be used to make Router generate URLs with hostname.
 
 ```yaml
-# config/services.yaml
-parameters:
-    router.request_context.host:   your-domain.com
-    router.request_context.scheme: http
+# config/packages/routing.yaml
+framework:
+    router:
+        default_uri: 'https://your-domain.com'
 ```
 
-> **Note:** You may noticed that there is nothing specific to this bundle.
+> **Note:** You may have noticed that there is nothing specific to this bundle.
 > In fact, doing this you just allowed your whole application to generate URLs from the command line.
-> Please have a look to Symfony's [official documentation](https://symfony.com/doc/current/console/request_context.html) 
+> Please have a look to Symfony's [official documentation](https://symfony.com/doc/current/routing.html#generating-urls-in-commands) 
 > for more information.
 
 

src/Command/DumpSitemapsCommand.php

@@ -72,7 +72,7 @@ protected function configure(): void
                 null,
                 InputOption::VALUE_REQUIRED,
                 'Base url to use for absolute urls. Good example - http://acme.com/, bad example - acme.com.' .
-                ' Defaults to router.request_context.host parameter'
+                ' Defaults to Symfony\'s default routing context'
             )
             ->addOption(
                 'gzip',