Improve comment in generated code

Author: GromNaN

lib/Doctrine/ODM/MongoDB/Hydrator/HydratorFactory.php

@@ -294,7 +294,7 @@ private function generateHydratorClass(ClassMetadata $class, string $hydratorCla
                 $code .= sprintf(
                     <<<'EOF'
 
-        // ReferenceMany & EmbedMany
+        // %4$s
         $mongoData = $data['%1$s'] ?? null;
 
         if ($mongoData !== null && ! is_array($mongoData)) {
@@ -316,6 +316,7 @@ private function generateHydratorClass(ClassMetadata $class, string $hydratorCla
                     $mapping['name'],
                     $mapping['fieldName'],
                     $class->getName(),
+                    $mapping['association'] === ClassMetadata::REFERENCE_MANY ? 'ReferenceMany' : 'EmbedMany',
                 );
             } elseif ($mapping['association'] === ClassMetadata::EMBED_ONE) {
                 $code .= sprintf(