Add note on ESU for Server 2012 (#9064)

* Add note on ESU for Server 2012

* Update supported-os.md

* Update release-notes/8.0/supported-os.md

Co-authored-by: Jamshed Damkewala <jamshedd@users.noreply.github.com>

---------

Co-authored-by: Rich Lander <rlander@microsoft.com>
Co-authored-by: Jamshed Damkewala <jamshedd@users.noreply.github.com>

release-notes/8.0/supported-os.md

@@ -10,10 +10,12 @@ OS                                    | Version                 | Architectures
 --------------------------------------|-------------------------|-----------------|----------
 [Windows 10 Client][Windows-client]   | Version 1607+           | x64, x86, Arm64 | [Windows][Windows-lifecycle]
 [Windows 11][Windows-client]          | Version 22000+          | x64, x86, Arm64 | [Windows][Windows-lifecycle]
-[Windows Server][Windows-Server]      | 2012+                   | x64, x86        | [Windows Server][Windows-Server-lifecycle]
-[Windows Server Core][Windows-Server] | 2012+                   | x64, x86        | [Windows Server][Windows-Server-lifecycle]
+[Windows Server][Windows-Server]      | 2012+ (*)               | x64, x86        | [Windows Server][Windows-Server-lifecycle]
+[Windows Server Core][Windows-Server] | 2012+ (*)               | x64, x86        | [Windows Server][Windows-Server-lifecycle]
 [Nano Server][Nano-Server]            | Version 1809+           | x64             | [Windows Server][Windows-Server-lifecycle]
 
+**\*** Windows Server 2012 and Windows Server 2012 R2 are supported with [Extended Security Updates](https://learn.microsoft.com/windows-server/get-started/extended-security-updates-overview) installed
+
 [Windows-client]: https://www.microsoft.com/windows/
 [Windows-lifecycle]: https://support.microsoft.com/help/13853/windows-lifecycle-fact-sheet
 [win-client-docker]: https://hub.docker.com/_/microsoft-windows