Add content about expression parameter

Author: Clare Zheng (Shanghai Wicresoft Co Ltd)

articles/data-factory/connector-servicenow.md

@@ -7,7 +7,7 @@ author: jianleishen
 ms.subservice: data-movement
 ms.topic: conceptual
 ms.custom: synapse
-ms.date: 10/16/2024
+ms.date: 10/23/2024
 ---
 
 # Copy data from ServiceNow using Azure Data Factory or Synapse Analytics
@@ -154,6 +154,9 @@ To copy data from ServiceNow, set the source type in the copy activity to **Serv
 | operators | The operator value. For more information about operators, see *Operators available for choice fields containing strings* section in this [article](https://docs.servicenow.com/bundle/vancouver-platform-user-interface/page/use/common-ui-elements/reference/r_OpAvailableFiltersQueries.html).| Yes when the expression type is Unary or Binary |
 | operands | List of expressions on which operator is applied.| Yes when the expression type is Unary or Binary |
 
+> [!TIP]
+> You can use dynamic content to configure the expression. The example format is provided in the JSON below under the expression property.
+
 **Example:**
 
 ```json