Update extension.rst

when using `DependencyInjection\Extension\Extension`, the `addAnnotatedClassesToCompile` is not available. so it should be mentionned that we need to use `HttpKernel\DependencyInjection\Extension` instead when the method `addAnnotatedClassesToCompile` must be used
symfony · wouterj · Jan 25, 2022 · Jan 24, 2022 · Jan 25, 2022 · 7e3106bb58748871902a660c68b8da2b96efa982
commit 7e3106bb58748871902a660c68b8da2b96efa982
diff --git a/bundles/extension.rst b/bundles/extension.rst
@@ -34,7 +34,7 @@ This is how the extension of an AcmeHelloBundle should look like::
    namespace Acme\HelloBundle\DependencyInjection;

    use Symfony\Component\DependencyInjection\ContainerBuilder;
-    use Symfony\Component\DependencyInjection\Extension\Extension;
+    use Symfony\Component\HttpKernel\DependencyInjection\Extension;

    class AcmeHelloExtension extends Extension
    {