gh-131741: Add doc for version detection change in platform

Document the behavior change between 3.11 & 3.12, where `platform` now correctly detects Windows 11 and Windows Server releases past Windows Server 2012.

Author: idann

Doc/whatsnew/3.12.rst

@@ -811,6 +811,17 @@ pathlib
   :meth:`pathlib.Path.rglob` and :meth:`pathlib.PurePath.match` for matching
   the path's case sensitivity, allowing for more precise control over the matching process.
 
+platform
+--------
+
+* Add support for detecting Windows 11 and Windows Server releases past 2012.
+  Prior, lookups on Windows Server platforms newer than Windows Server 2012
+  and on Windows 11 would return `Windows-10`.
+  (Contributed by Steve Dower in :gh:`89545`.)
+
+* Add support for detecting Windows Server 2025.
+  (Contributed by Wulian233 in :gh:`127732`.)
+
 pdb
 ---