Fix docs

Author: zrgt

sdk/basyx/aas/adapter/aasx.py

@@ -570,7 +570,7 @@ def write_all_aas_objects(self,
         :class:`~basyx.aas.model.submodel.Submodel` objects, supplementary files which are referenced by
         :class:`~basyx.aas.model.submodel.File` objects within those Submodels, are fetched from the ``file_store``
         and added to the AASX package. If the ObjectStore contains a thumbnail referenced by
-        :attr:`~basyx.aas.model.aas.AssetInformation.default_thumbnail`, it is also added to the AASX package.
+        ``default_thumbnail`` in :class:`~basyx.aas.model.aas.AssetInformation`, it is also added to the AASX package.
 
         .. attention::