feature/pgtk f1a6022: Add WAYLAND_DISPLAY description to cmdargs.texi

[Yuuki Harano]

branch: feature/pgtk
commit f1a60225152af1f87d8580db0785cf5a0a9c7544
Author: Yuuki Harano <masm+github@masm11.me>
Commit: Yuuki Harano <masm+github@masm11.me>

    Add WAYLAND_DISPLAY description to cmdargs.texi
    
    * doc/emacs/cmdargs.texi (Misc Variables): Add WAYLAND_DISPLAY
    description.
---
 doc/emacs/cmdargs.texi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/emacs/cmdargs.texi b/doc/emacs/cmdargs.texi
index 86c04c8..b1e471f 100644
--- a/doc/emacs/cmdargs.texi
+++ b/doc/emacs/cmdargs.texi
@@ -756,6 +756,10 @@ On MS-Windows, if you set this variable, Emacs will load 
and initialize
 the network library at startup, instead of waiting until the first
 time it is required.
 
+@item WAYLAND_DISPLAY
+Pgtk Emacs (built with @option{--with-pgtk}) can run on Wayland natively.
+@env{WAYLAND_DISPLAY} specifies the connection to the compositor.
+
 @item emacs_dir
 On MS-Windows, @env{emacs_dir} is a special environment variable, which
 indicates the full path of the directory in which Emacs is installed.