removed broken link added new correct link

as per the user report #8473 , so i replaced the broken link to correct link.

windows/security/threat-protection/index.md

@@ -17,7 +17,7 @@ ms.topic: conceptual
 ---
 
 # Threat Protection
-[Microsoft Defender Advanced Threat Protection (Microsoft Defender ATP)](https://go.microsoft.com/fwlink/p/?linkid=2069559) is a unified platform for preventative protection, post-breach detection, automated investigation, and response. Microsoft Defender ATP protects endpoints from cyber threats; detects advanced attacks and data breaches, automates security incidents and improves security posture.
+[Microsoft Defender Advanced Threat Protection (Microsoft Defender ATP)](https://docs.microsoft.com/windows/security/threat-protection/microsoft-defender-atp/microsoft-defender-advanced-threat-protection) is a unified platform for preventative protection, post-breach detection, automated investigation, and response. Microsoft Defender ATP protects endpoints from cyber threats; detects advanced attacks and data breaches, automates security incidents and improves security posture.
 
 >[!TIP]
 > Enable your users to access cloud services and on-premises applications with ease and enable modern management capabilities for all devices. For more information, see [Secure your remote workforce](https://docs.microsoft.com/enterprise-mobility-security/remote-work/).