update TOC

Author: mumian

articles/azure-resource-manager/bicep/data-types.md

@@ -2,12 +2,12 @@
 title: Data types in Bicep
 description: Describes the data types that are available in Bicep
 ms.topic: conceptual
-ms.date: 12/12/2022
+ms.date: 01/10/2023
 ---
 
 # Data types in Bicep
 
-This article describes the data types supported in [Bicep](./overview.md).
+This article describes the data types supported in [Bicep](./overview.md). [User-defined data types](./user-defined-data-types.md) are currently in preview. 
 
 ## Supported types
 

articles/azure-resource-manager/bicep/toc.yml

@@ -256,6 +256,9 @@
   - name: Data types
     href: data-types.md
     displayName: supported types,arrays,booleans,integers,objects,strings,secure
+  - name: User-defined data types (type)
+    displayName: custom
+    href: user-defined-data-types.md
   - name: Parameters (param)
     href: parameters.md
     displayName: decorators,secure,objects,constraints