fix wayland Display::all() comment (#8664)

Signed-off-by: 21pages <sunboeasy@gmail.com>

libs/scrap/src/common/linux.rs

@@ -59,7 +59,7 @@ impl Display {
         })
     }
 
-    // Call this function carefully for wayland, it may cause blocking
+    // Currently, wayland need to call wayland::clear() before call Display::all()
     pub fn all() -> io::Result<Vec<Display>> {
         Ok(if super::is_x11() {
             x11::Display::all()?

src/server/display_service.rs

@@ -186,7 +186,7 @@ fn check_get_displays_changed_msg() -> Option<Message> {
 pub fn check_displays_changed() -> ResultType<()> {
     #[cfg(target_os = "linux")]
     {
-        // For wayland, call Display::all() in video service will cause block, reproduced by refresh, I don't know the reason.
+        // Currently, wayland need to call wayland::clear() before call Display::all(), otherwise it will cause
         // block, or even crash here, https://github.com/rustdesk/rustdesk/blob/0bb4d43e9ea9d9dfb9c46c8d27d1a97cd0ad6bea/libs/scrap/src/wayland/pipewire.rs#L235
         if !is_x11() {
             return Ok(());