New link for MHSM mode. Added preview ADF RP mode

Author: shanhix1

articles/governance/policy/concepts/definition-structure.md

@@ -146,7 +146,8 @@ The following Resource Provider modes are fully supported:
 
 The following Resource Provider modes are currently supported as a **[preview](https://azure.microsoft.com/support/legal/preview-supplemental-terms/)**:
 
-- `Microsoft.ManagedHSM.Data` for managing [Managed HSM](../../../key-vault/managed-hsm/overview.md) keys using Azure Policy.
+- `Microsoft.ManagedHSM.Data` for managing [Managed HSM](../../../key-vault/managed-hsm/azure-policy.md) keys using Azure Policy.
+- `Microsoft.DataFactory.Data` for using Azure Policy to deny [Azure Data Factory](../../../data-factory/introduction.md) outbound traffic domain names not specified in an allow list.
 
 > [!NOTE]
 >Unless explicitly stated, Resource Provider modes only support built-in policy definitions, and exemptions are not supported at the component-level.