[Form] [DoctrineBridge] updated changelogs after #18359

follows #18359.

UPGRADE-3.1.md

@@ -39,7 +39,10 @@ Form
    'choice_label' => function ($choice) {
        return strtoupper($choice);
    },
-   ```   
+   ```
+
+ * Caching of the loaded `ChoiceListInterface` in the `LazyChoiceList` has been deprecated,
+   it must be cached in the `ChoiceLoaderInterface` implementation instead.
 
 FrameworkBundle
 ---------------

UPGRADE-4.0.md

@@ -36,6 +36,8 @@ Form
    },
    ```
 
+ * Caching of the loaded `ChoiceListInterface` in the `LazyChoiceList` has been removed,
+   it must be cached in the `ChoiceLoaderInterface` implementation instead.
 
 FrameworkBundle
 ---------------

src/Symfony/Bridge/Doctrine/CHANGELOG.md

@@ -7,6 +7,8 @@ CHANGELOG
  * added "{{ value }}" message placeholder to UniqueEntityValidator
  * deprecated `MergeDoctrineCollectionListener::onBind` in favor of
    `MergeDoctrineCollectionListener::onSubmit`
+ * deprecated passing `ChoiceListFactoryInterface` as first argument of
+   `DoctrineChoiceLoader`'s constructor
 
 3.0.0
 -----

src/Symfony/Bridge/Doctrine/Form/ChoiceList/DoctrineChoiceLoader.php

@@ -24,11 +24,6 @@ use Symfony\Component\Form\ChoiceList\Loader\ChoiceLoaderInterface;
  */
 class DoctrineChoiceLoader implements ChoiceLoaderInterface
 {
-    /**
-     * @var ChoiceListFactoryInterface
-     */
-    private $factory;
-
     /**
      * @var ObjectManager
      */
@@ -78,7 +73,6 @@ class DoctrineChoiceLoader implements ChoiceLoaderInterface
 
             // Provide a BC layer since $factory has changed
             // form first to last argument as of 3.1
-            $this->factory = $manager;
             $manager = $class;
             $class = $idReader;
             $objectLoader = $factory;

src/Symfony/Component/Form/CHANGELOG.md

@@ -10,6 +10,7 @@ CHANGELOG
  * Using callable strings as choice options in `ChoiceType` has been deprecated
    and will be used as `PropertyPath` instead of callable in Symfony 4.0.
  * implemented `DataTransformerInterface` in `TextType`
+ * deprecated caching loaded choice list in `LazyChoiceList::$loadedList`
 
 3.0.0
 -----