added metadata to includes file

Author: julieMSFT

articles/synapse-analytics/includes/note-preview.md

@@ -1,3 +1,10 @@
+---
+author: julieMSFT
+ms.service: synapse-analytics  
+ms.topic: include
+ms.date: 4/6/2020
+ms.author: jrasnick
+---
 > [!IMPORTANT]
 > Azure Synapse Analytics (Workspaces) is currently in public preview.
 > This preview version is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities.