[CS] Fix more nullable types

Follows #19786

Author: smnandre

components/expression_language.rst

@@ -359,7 +359,7 @@ or by using the second argument of the constructor::
 
         class ExpressionLanguage extends BaseExpressionLanguage
         {
-            public function __construct(CacheItemPoolInterface $cache = null, array $providers = [])
+            public function __construct(?CacheItemPoolInterface $cache = null, array $providers = [])
             {
                 // prepends the default provider to let users override it
                 array_unshift($providers, new StringExpressionLanguageProvider());

components/serializer.rst

@@ -118,7 +118,7 @@ exists in your project::
             $this->sportsperson = $sportsperson;
         }
 
-        public function setCreatedAt(\DateTime $createdAt = null): void
+        public function setCreatedAt(?\DateTime $createdAt = null): void
         {
             $this->createdAt = $createdAt;
         }
@@ -798,7 +798,7 @@ When serializing, you can set a callback to format a specific object property::
     $encoder = new JsonEncoder();
 
     // all callback parameters are optional (you can omit the ones you don't use)
-    $dateCallback = function ($innerObject, $outerObject, string $attributeName, string $format = null, array $context = []) {
+    $dateCallback = function ($innerObject, $outerObject, string $attributeName, ?string $format = null, array $context = []) {
         return $innerObject instanceof \DateTime ? $innerObject->format(\DateTime::ISO8601) : '';
     };
 
@@ -1605,7 +1605,7 @@ having unique identifiers::
     $classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
 
     // all callback parameters are optional (you can omit the ones you don't use)
-    $maxDepthHandler = function ($innerObject, $outerObject, string $attributeName, string $format = null, array $context = []) {
+    $maxDepthHandler = function ($innerObject, $outerObject, string $attributeName, ?string $format = null, array $context = []) {
         return '/foos/'.$innerObject->id;
     };
 

controller/error_pages.rst

@@ -216,7 +216,7 @@ contents, create a new Normalizer that supports the ``FlattenException`` input::
 
     class MyCustomProblemNormalizer implements NormalizerInterface
     {
-        public function normalize($exception, string $format = null, array $context = [])
+        public function normalize($exception, ?string $format = null, array $context = [])
         {
             return [
                 'content' => 'This is my custom problem normalizer.',
@@ -227,7 +227,7 @@ contents, create a new Normalizer that supports the ``FlattenException`` input::
             ];
         }
 
-        public function supportsNormalization($data, string $format = null)
+        public function supportsNormalization($data, ?string $format = null)
         {
             return $data instanceof FlattenException;
         }

form/dynamic_form_modification.rst

@@ -459,7 +459,7 @@ The type would now look like::
                 ])
             ;
 
-            $formModifier = function (FormInterface $form, Sport $sport = null) {
+            $formModifier = function (FormInterface $form, ?Sport $sport = null) {
                 $positions = null === $sport ? [] : $sport->getAvailablePositions();
 
                 $form->add('position', EntityType::class, [

frontend/custom_version_strategy.rst

@@ -68,7 +68,7 @@ version string::
          * @param string      $manifestPath
          * @param string|null $format
          */
-        public function __construct(string $manifestPath, string $format = null)
+        public function __construct(string $manifestPath, ?string $format = null)
         {
             $this->manifestPath = $manifestPath;
             $this->format = $format ?: '%s?%s';

http_client.rst

@@ -1651,7 +1651,7 @@ If you want to extend the behavior of a base HTTP client, you can use
     {
         private $decoratedClient;
 
-        public function __construct(HttpClientInterface $decoratedClient = null)
+        public function __construct(?HttpClientInterface $decoratedClient = null)
         {
             $this->decoratedClient = $decoratedClient ?? HttpClient::create();
         }
@@ -1667,7 +1667,7 @@ If you want to extend the behavior of a base HTTP client, you can use
             return $response;
         }
 
-        public function stream($responses, float $timeout = null): ResponseStreamInterface
+        public function stream($responses, ?float $timeout = null): ResponseStreamInterface
         {
             return $this->decoratedClient->stream($responses, $timeout);
         }

messenger.rst

@@ -2220,7 +2220,7 @@ provided in order to ease the declaration of these special handlers::
     {
         use BatchHandlerTrait;
 
-        public function __invoke(MyMessage $message, Acknowledger $ack = null)
+        public function __invoke(MyMessage $message, ?Acknowledger $ack = null)
         {
             return $this->handle($message, $ack);
         }

messenger/custom-transport.rst

@@ -50,7 +50,7 @@ Here is a simplified example of a database transport::
         /**
          * @param FakeDatabase $db is used for demo purposes. It is not a real class.
          */
-        public function __construct(FakeDatabase $db, SerializerInterface $serializer = null)
+        public function __construct(FakeDatabase $db, ?SerializerInterface $serializer = null)
         {
             $this->db = $db;
             $this->serializer = $serializer ?? new PhpSerializer();

notifier.rst

@@ -778,7 +778,7 @@ and its ``asChatMessage()`` method::
             $this->price = $price;
         }
 
-        public function asChatMessage(RecipientInterface $recipient, string $transport = null): ?ChatMessage
+        public function asChatMessage(RecipientInterface $recipient, ?string $transport = null): ?ChatMessage
         {
             // Add a custom subject and emoji if the message is sent to Slack
             if ('slack' === $transport) {

profiler.rst

@@ -255,7 +255,7 @@ request::
 
     class RequestCollector extends AbstractDataCollector
     {
-        public function collect(Request $request, Response $response, \Throwable $exception = null)
+        public function collect(Request $request, Response $response, ?\Throwable $exception = null)
         {
             $this->data = [
                 'method' => $request->getMethod(),