More stub fixes

Author: ondrejmirtes

stubs/DocumentManager.stub

@@ -26,7 +26,7 @@ class DocumentManager implements ObjectManager
 	public function merge($document);
 
 	/**
-	 * @template T
+	 * @template T of object
 	 * @phpstan-param class-string<T> $documentName
 	 * @phpstan-return DocumentRepository<T>
 	 */

stubs/DocumentRepository.stub

@@ -5,7 +5,7 @@ namespace Doctrine\ODM\MongoDB\Repository;
 use Doctrine\Persistence\ObjectRepository;
 
 /**
- * @template TDocumentClass
+ * @template TDocumentClass of object
  * @implements ObjectRepository<TDocumentClass>
  */
 class DocumentRepository implements ObjectRepository