update formatting

Author: markingmyname

articles/postgresql/index.yml

@@ -227,7 +227,7 @@ landingContent:
         links:
           - text: Azure Database for PostgreSQL
             url: /training/paths/introduction-to-azure-postgres/
-      - linkListType: whats-new
+      - linkListType: learn
         links:
           - text: Azure Cosmos DB for PostgreSQL
             url: /training/paths/azure-cosmos-db-for-postgresql/