in swagger mark property as readOnly when is not writable and initializable

Author: komik966

src/Swagger/Serializer/DocumentationNormalizer.php

@@ -445,7 +445,7 @@ private function getPropertySchema(PropertyMetadata $propertyMetadata, \ArrayObj
     {
         $propertySchema = new \ArrayObject($propertyMetadata->getAttributes()['swagger_context'] ?? []);
 
-        if (false === $propertyMetadata->isWritable()) {
+        if (false === $propertyMetadata->isWritable() && !$propertyMetadata->isInitializable()) {
             $propertySchema['readOnly'] = true;
         }