Fixed broken use statements

Author: Nyholm

migration.rst

@@ -238,7 +238,7 @@ could look something like this::
     // public/index.php
     use App\Kernel;
     use App\LegacyBridge;
-    use Symfony\Component\Debug\Debug;
+    use Symfony\Component\ErrorHandler\Debug;
     use Symfony\Component\HttpFoundation\Request;
 
     require dirname(__DIR__).'/vendor/autoload.php';

reference/constraints/Compound.rst

@@ -26,7 +26,7 @@ you can create your own named set or requirements to be reused consistently ever
     // src/Validator/Constraints/PasswordRequirements.php
     namespace App\Validator\Constraints;
 
-    use Symfony\Component\Validator\Compound;
+    use Symfony\Component\Validator\Constraints\Compound;
     use Symfony\Component\Validator\Constraints as Assert;
 
     /**

reference/constraints/Traverse.rst

@@ -26,8 +26,8 @@ that all have constraints on their properties.
         // src/Entity/BookCollection.php
         namespace App\Entity;
 
-        use Doctrine\Collections\ArrayCollection;
-        use Doctrine\Collections\Collection
+        use Doctrine\Common\Collections\ArrayCollection;
+        use Doctrine\Common\Collections\Collection
         use Doctrine\ORM\Mapping as ORM;
         use Symfony\Component\Validator\Constraints as Assert;
 

routing.rst

@@ -2247,7 +2247,7 @@ session shouldn't be used when matching a request:
 
         // config/routes.php
         use App\Controller\MainController;
-        use Symfony\Bundle\FrameworkBundle\Routing\Loader\Configurator\RoutingConfigurator;
+        use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
 
         return function (RoutingConfigurator $routes) {
             $routes->add('homepage', '/')