add link to network security

Author: vhorne

articles/firewall/detect-malware-with-sentinel.md

@@ -135,4 +135,4 @@ Detection Query for `Sunburst` Malware: [Firewall Malware Detections for Sentine
 - [Azure Firewall with Microsoft Sentinel overview](firewall-sentinel-overview.md)
 - [Detect new threats using Microsoft Sentinel with Azure Web Application Firewall](../web-application-firewall/waf-new-threat-detection.md)
 - [Learn more about Microsoft Sentinel](../sentinel/overview.md)
-- [Microsoft security](https://www.microsoft.com/en-us/security/business)
+- [Azure network security documentation](../networking/security/index.yml)