Merge pull request #2 from radarhere/image_grab_wayland_kde

Updated documentation

Author: AdianKozlica

docs/reference/ImageGrab.rst

@@ -16,8 +16,9 @@ or the clipboard to a PIL image memory.
     the entire screen is copied, and on macOS, it will be at 2x if on a Retina screen.
 
     On Linux, if ``xdisplay`` is ``None`` and the default X11 display does not return
-    a snapshot of the screen, ``gnome-screenshot`` will be used as fallback if it is
-    installed. To disable this behaviour, pass ``xdisplay=""`` instead.
+    a snapshot of the screen, ``gnome-screenshot`` or ``spectacle`` will be used as a
+    fallback if they are installed. To disable this behaviour, pass ``xdisplay=""``
+    instead.
 
     .. versionadded:: 1.1.3 (Windows), 3.0.0 (macOS), 7.1.0 (Linux)