Add limitation for FCI

For FCI, Startup accounts can only be domain account or gMSA.
I could see that limitation with setup GUI for FCI, but I could not find it in a Docs, so I added here as many customers see this document for choosing startup account.

Author: taroarai

docs/database-engine/configure-windows/configure-windows-service-accounts-and-permissions.md

@@ -66,6 +66,9 @@ Depending on the components that you decide to install, SQL Server setup install
 
 Startup accounts used to start and run SQL Server can be [domain user accounts](#Domain_User), [local user accounts](#Local_User), [managed service accounts](#MSA), [virtual accounts](#VA_Desc), or [built-in system accounts](#Local_Service). To start and run, each service in SQL Server must have a startup account configured during installation.
 
+  > [!NOTE]
+  > For SQL Server Failover Cluster Instance (FCI), [domain user accounts](#Domain_User) or .[Group-Managed Service Accounts].(#GMSA) (SQL Server 2016 and later) can be used as Startup accounts for SQL Server.
+
 This section describes the accounts that can be configured to start SQL Server services, the default values used by SQL Server Setup, the concept of per-service SID's, the startup options, and configuring the firewall.
 
 - [Default Service Accounts](#Default_Accts)
@@ -590,4 +593,4 @@ The following table shows service names that are displayed by localized versions
 
 - [File Locations for Default and Named Instances of SQL Server](../../sql-server/install/file-locations-for-default-and-named-instances-of-sql-server.md)
 
-- [Install Master Data Services](../../master-data-services/install-windows/install-master-data-services.md)
+- [Install Master Data Services](../../master-data-services/install-windows/install-master-data-services.md)