doc: migration-guide-4.1: add note about nxp,kinetis-wdog32 change

Add note about compatible change for nxp,kinetis-wdog32.

Signed-off-by: Manuel Argüelles <manuel.arguelles@nxp.com>

doc/releases/migration-guide-4.1.rst

@@ -172,6 +172,11 @@ Video
   The new ``video-controls.h`` source now contains description of each control ID to help
   disambiguating.
 
+Watchdog
+========
+
+* Renamed the ``compatible`` from ``nxp,kinetis-wdog32`` to :dtcompatible:`nxp,wdog32`.
+
 Bluetooth
 *********