Make form identifier correspond to its data

Author: LucileDT

reference/forms/types/options/choice_attr.rst.inc

@@ -13,7 +13,7 @@ If an array, the keys of the ``choices`` array must be used as keys::
     use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
     // ...
 
-    $builder->add('attending', ChoiceType::class, [
+    $builder->add('fruits', ChoiceType::class, [
         'choices' => [
             1 => Apple,
             2 => Banana,