fix comment

Author: iddqdex

ydb/iam/auth.py

@@ -22,7 +22,7 @@
         from ydb.public.api.client.yc_public.iam import iam_token_service_pb2
     except ImportError:
         try:
-            # This attempt is to enable the IAM auth inside the YDB repository on GitHub
+            # This attempt is to enable the IAM auth inside the YDB repository on Arcadia
             from contrib.ydb.public.api.client.yc_public.iam import iam_token_service_pb2_grpc
             from contrib.ydb.public.api.client.yc_public.iam import iam_token_service_pb2
         except ImportError: