fix warnings

Theo van Kraay · Theo van Kraay · commit 51bfe82fb32e · 2023-09-07T21:32:01.000+01:00
diff --git a/articles/cosmos-db/cassandra/choose-service.md b/articles/cosmos-db/cassandra/choose-service.md
@@ -5,6 +5,7 @@ author: TheovanKraay
 ms.author: thvankra
 ms.reviewer: mjbrown
 ms.service: cosmos-db
+ms.subservice: apache-cassandra
 ms.topic: quickstart
 ms.date: 09/05/2023
 ---
