fixed error message

Author: evanevanevanevannnn

ydb/core/external_sources/object_storage.cpp

@@ -277,7 +277,7 @@ struct TObjectStorageExternalSource : public IExternalSource {
             if (type.has_optional_type() && type.optional_type().item().has_optional_type()) {
                 issues.AddIssue(MakeErrorIssue(
                     Ydb::StatusIds::BAD_REQUEST,
-                    TStringBuilder{} << "Double optional types are not supported for bindings (you have '" 
+                    TStringBuilder{} << "Double optional types are not supported (you have '" 
                         << column.name() << " " << NYdb::TType(column.type()).ToString() << "' field)"));
             }
         }

ydb/core/external_sources/object_storage_ut.cpp

@@ -61,7 +61,7 @@ Y_UNIT_TEST_SUITE(ObjectStorageTest) {
         NKikimrExternalSources::TGeneral general;
         auto newColumn = schema.add_column();
         newColumn->mutable_type()->mutable_optional_type()->mutable_item()->mutable_optional_type()->mutable_item()->set_type_id(Ydb::Type::INT32);
-        UNIT_ASSERT_EXCEPTION_CONTAINS(source->Pack(schema, general), NExternalSource::TExternalSourceException, "Double optional types are not supported for bindings");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(source->Pack(schema, general), NExternalSource::TExternalSourceException, "Double optional types are not supported");
     }
 
     Y_UNIT_TEST(WildcardsValidation) {