Add missing use statement for LiveCollectionType

Author: zairigimad

src/LiveComponent/src/Resources/doc/index.rst

@@ -1204,6 +1204,7 @@ via the ``LiveCollectionType``::
     use Symfony\Component\Form\FormBuilderInterface;
     use Symfony\Component\OptionsResolver\OptionsResolver;
     use Symfony\UX\LiveComponent\Form\Type\LiveCollectionType;
+    use Symfony\UX\LiveComponent\Attribute\LiveProp;
     use App\Entity\BlogPost;
 
     class BlogPostFormType extends AbstractType