Add Cognitive Search to list of supported services

Author: johndowns

articles/private-link/private-link-overview.md

@@ -46,6 +46,7 @@ Azure Private Link provides the following benefits:
 |  |  Azure Database for PostgreSQL - Single server         | All public regions      |   Preview      |
 |  |  Azure Database for MySQL         | All public regions      |   Preview      |
 |  |  Azure Database for MariaDB         | All public regions      |   Preview      |
+|  |  Azure Cognitive Search | West US 2, West Central US, East US, South Central US, Australia East, Australia Southeast | Preview <br/> [Learn more](/azure/search/service-create-private-endpoint) |
 
 For the most up-to-date notifications, check the [Azure Virtual Network updates page](https://azure.microsoft.com/updates/?product=virtual-network).