docs: add release notes for #81184

Added release notes for PR #81184.

Signed-off-by: Martin Stumpf <[email protected]>

Author: Finomnis

doc/releases/release-notes-4.1.rst

@@ -97,6 +97,7 @@ Drivers and Sensors
     signal handling (:github:`81250`)
   * Added ``frame_incomplete`` handling to SDL display driver (:dtcompatible:`zephyr,sdl-dc`)
     (:github:`81250`)
+  * Added transparency support to SDL display driver (:dtcompatible:`zephyr,sdl-dc`) (:github:`81184`)
 
 * Ethernet
 
@@ -292,6 +293,9 @@ LVGL
 Tests and Samples
 *****************
 
+* Fixed incorrect alpha values in :zephyr_file:`samples/drivers/display`. (:github:`81184`)
+* Added :zephyr_file:`samples/modules/lvgl/screen_transparency`. (:github:`81184`)
+
 Issue Related Items
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