Update description

Author: Clare Zheng (Shanghai Wicresoft Co Ltd)

articles/data-factory/connector-google-bigquery-legacy.md

@@ -1,7 +1,7 @@
 ---
 title: Copy data from Google BigQuery using legacy
 titleSuffix: Azure Data Factory & Azure Synapse
-description: Learn how to copy data from Google BigQuery to supported sink data stores by using a copy activity in an Azure Data Factory or Synapse Analytics pipeline.
+description: Learn how to copy data from Google BigQuery to supported sink data stores by using a copy activity in a legacy Azure Data Factory or Synapse Analytics pipeline.
 ms.author: jianleishen
 author: jianleishen
 ms.service: data-factory