minor #18797 [DependencyInjection] routing[https]: fix php configuration (kaznovac)

This PR was merged into the 6.3 branch.

Discussion
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[DependencyInjection] routing[https]: fix php configuration

fix using of nonexisting `$container->setParameter` method

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Commits
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419c79d routing[https]: fix php configuration

Author: javiereguiluz

routing.rst

@@ -2523,8 +2523,10 @@ method) or globally with these configuration parameters:
     .. code-block:: php
 
         // config/services.php
-        $container->setParameter('router.request_context.scheme', 'https');
-        $container->setParameter('asset.request_context.secure', true);
+        $container->parameters()
+            ->set('router.request_context.scheme', 'https')
+            ->set('asset.request_context.secure', true)
+        ;
 
 Outside of console commands, use the ``schemes`` option to define the scheme of
 each route explicitly: