Update google/cloud/bigtable/admin_v2/overlay/services/bigtable_table_admin/client.py

Co-authored-by: Mattie Fu <mattiefu@google.com>

Author: gkevinzheng

google/cloud/bigtable/admin_v2/overlay/services/bigtable_table_admin/client.py

@@ -240,7 +240,8 @@ def wait_for_consistency(
         metadata: Sequence[Tuple[str, Union[str, bytes]]] = (),
     ) -> bool:
         r"""Blocks until the mutations for the specified Table that have been
-        made before the call have been replicated. This is done by generating
+        made before the call have been replicated or reads using an app profile with `DataBoostIsolationReadOnly`
+        can see all writes committed before the token was created. This is done by generating
         a consistency token for the Table, then polling :meth:`check_consistency`
         for the specified table until the call returns True.