Update concept-easm.md

Author: danielledennis

articles/defender-for-cloud/concept-easm.md

@@ -26,5 +26,5 @@ EASM collects data for publicly exposed assets (“outside-in”). Defender for
 ## Next steps
 
 - Learn about [cloud security explorer and attack paths](concept-attack-path.md) in Defender for Cloud.
-- Learn about [Defender EASM](../external-attack-surface-management/index.md).
+- Learn about [Defender EASM](../external-attack-surface-management/overview.md).
 - Learn how to [deploy Defender for EASM](../external-attack-surface-management/deploying-the-defender-easm-azure-resource.md).