[DowngradePhp81] Add @readonly doc on property promotion readonly

Author: samsonasik

rules-tests/DowngradePhp81/Rector/Property/DowngradeReadonlyPropertyRector/Fixture/promoted_property.php.inc

@@ -20,6 +20,9 @@ namespace Rector\Tests\DowngradePhp81\Rector\Property\DowngradeReadonlyPropertyR
 class SomeClass
 {
     public function __construct(
+        /**
+         * @readonly
+         */
         public string $foo = 'foo'
     )
     {

rules-tests/DowngradePhp81/Rector/Property/DowngradeReadonlyPropertyRector/Fixture/readonly_implicit_property_promotion.php.inc

@@ -20,6 +20,9 @@ namespace Rector\Tests\DowngradePhp81\Rector\Property\DowngradeReadonlyPropertyR
 class ReadonlyImplicitPropertyPromotion
 {
     public function __construct(
+        /**
+         * @readonly
+         */
         public string $foo = 'foo'
     )
     {

rules/DowngradePhp81/Rector/Property/DowngradeReadonlyPropertyRector.php

@@ -89,24 +89,22 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
-        if ($node instanceof Property) {
-            $this->addPhpDocTag($node);
-        }
+        $this->addPhpDocTag($node);
 
         $this->visibilityManipulator->removeReadonly($node);
 
         return $node;
     }
 
-    private function addPhpDocTag(Property $property): void
+    private function addPhpDocTag(Property|Param $node): void
     {
-        $phpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($property);
+        $phpDocInfo = $this->phpDocInfoFactory->createFromNodeOrEmpty($node);
 
         if ($phpDocInfo->hasByName(self::TAGNAME)) {
             return;
         }
 
         $phpDocInfo->addPhpDocTagNode(new PhpDocTagNode('@' . self::TAGNAME, new GenericTagValueNode('')));
-        $this->docBlockUpdater->updateRefactoredNodeWithPhpDocInfo($property);
+        $this->docBlockUpdater->updateRefactoredNodeWithPhpDocInfo($node);
     }
 }