runtime(doc): Update help for Wayland support

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/gui_x11.txt b/runtime/doc/gui_x11.txt
index 23633f1..e1a615a 100644
--- a/runtime/doc/gui_x11.txt
+++ b/runtime/doc/gui_x11.txt
@@ -1,4 +1,4 @@
-*gui_x11.txt*   For Vim version 9.1.  Last change: 2022 Apr 03
+*gui_x11.txt*   For Vim version 9.1.  Last change: 2024 Jan 30
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -580,7 +580,8 @@
 							*gui-x11-kde*
 There is no KDE version of Vim.  There has been some work on a port using the
 Qt toolkit, but it never worked properly and it has been abandoned.  Work
-continues on Yzis: https://github.com/chrizel/Yzis.
+continues on Yzis: https://github.com/chrizel/Yzis but it seems also
+abandoned.
 
 ==============================================================================
 8. Compiling						*gui-x11-compiling*
@@ -647,6 +648,15 @@
 X11R5 with a library for X11R6 probably doesn't work (although the linking
 won't give an error message, Vim will crash later).
 
+							*gui-wayland*
+Initial support for the Wayland display server protocol has landed in patch
+9.0.0064. To enable it, you need to set the environment variable
+"$GVIM_ENABLE_WAYLAND" in your shell.
+
+Note: The Wayland protocol is subject to some restrictions, so the following
+functions won't work: |getwinpos()|, |getwinposx()|, |getwinposy()| and the
+|v:windowid| variable won't be available.
+
 ==============================================================================
 9. X11 selection mechanism				*x11-selection*