Update IS_OBJECT

Author: seesharprun

articles/cosmos-db/nosql/query/is-object.md

@@ -1,7 +1,7 @@
 ---
 title: IS_OBJECT
 titleSuffix: Azure Cosmos DB for NoSQL
-description: An Azure Cosmos DB for NoSQL system function that returns
+description: An Azure Cosmos DB for NoSQL system function that returns true if the type of the specified expression is a JSON object.
 author: jcodella
 ms.author: jacodel
 ms.reviewer: sidandrews