Update stream-analytics-parsing-json.md

Author: mamccrea

articles/stream-analytics/stream-analytics-parsing-json.md

@@ -13,8 +13,7 @@ Azure Stream Analytics support processing events in CSV, JSON, and Avro data for
 
 >[!NOTE]
 >AVRO files created by Event Hub Capture use a specific format that requires you to use the *custom deserializer* feature. For more information, see [Read input in any format using .NET custom deserializers](https://docs.microsoft.com/azure/stream-analytics/custom-deserializer-examples).
->Avro maps are not supported.
-
+>Stream Analytics AVRO deserialization does not support Map type. Stream Analytics can't read EventHub capture blobs because EventHub capture uses map.
 
 
 ## Record data types