docs/env_vars: _WAYLAND_DISPLAY isn't used anymore
@@ -42,7 +42,7 @@ wlroots reads these environment variables
# Generic
* *DISPLAY*: if set probe X11 backend in *wlr_backend_autocreate*
-* *WAYLAND_DISPLAY*, *_WAYLAND_DISPLAY*, *WAYLAND_SOCKET*: if set probe Wayland
- backend in *wlr_backend_autocreate*
+* *WAYLAND_DISPLAY*, *WAYLAND_SOCKET*: if set probe Wayland backend in
+ `wlr_backend_autocreate`
* *XCURSOR_PATH*: directory where xcursors are located
* *XDG_SESSION_ID*: if set, session ID used by the logind session
