runtime(doc): clarify expand() for :terminal windows

While adding to the documentation, also mention the rolled-back key-translation
strategy in version9.txt

closes: #14069

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index 29dbfb8..7b9a366 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2024 Jan 05
+*version9.txt*  For Vim version 9.1.  Last change: 2024 Feb 21
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41578,6 +41578,9 @@
 ==============================================================================
 INCOMPATIBLE CHANGES				*incompatible-9.2*
 
+Improved/Different MS-Windows mapping support
+|w32-experimental-keycode-trans-strategy|
+
 ==============================================================================
 IMPROVEMENTS					*improvements-9.2*