Added release notes for python-pillow#8912

Author: radarhere

docs/releasenotes/11.3.0.rst

@@ -47,6 +47,12 @@ TODO
 Other changes
 =============
 
+Support using grim with ImageGrab on Linux
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+:py:meth:`~PIL.ImageGrab.grab` is now able to detect and use ``gnome-screenshot``,
+``grim`` or ``spectacle`` on Linux in order to take a snapshot of the screen.
+
 Do not build against libavif < 1
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^