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/terminal.txt b/runtime/doc/terminal.txt
index c5331fa..3720603 100644
--- a/runtime/doc/terminal.txt
+++ b/runtime/doc/terminal.txt
@@ -1,4 +1,4 @@
-*terminal.txt*	For Vim version 9.1.  Last change: 2023 Nov 08
+*terminal.txt*	For Vim version 9.1.  Last change: 2024 Feb 21
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -208,6 +208,7 @@
 			[command].  Use `:execute` if you must have a Vim
 			command following in the same line.
 
+							*terminal-bufname*
 			A new buffer will be created, using [command] or
 			'shell' as the name, prefixed with a "!".  If a buffer
 			by this name already exists a number is added in