doc: releases: 4.0: add CAN release notes

Add CAN related release notes for Zephyr v4.0.0.

Signed-off-by: Henrik Brix Andersen <[email protected]>

Author: henrikbrixandersen

doc/releases/migration-guide-4.0.rst

@@ -196,9 +196,6 @@ Clock control
            load-capacitance-femtofarad = <...>;
      };
 
-Controller Area Network (CAN)
-=============================
-
 Crypto
 ======
 

doc/releases/release-notes-4.0.rst

@@ -298,6 +298,11 @@ Drivers and Sensors
 
 * CAN
 
+  * Added initial support for Renesas RA CANFD (:dtcompatible:`renesas,ra-canfd-global`,
+    :dtcompatible:`renesas,ra-canfd`)
+  * Added Flexcan support for S32Z27x (:dtcompatible:`nxp,flexcan`, :dtcompatible:`nxp,flexcan-fd`)
+  * Improved NXP S32 CANXL error reporting (:dtcompatible:`nxp,s32-canxl`)
+
 * Charger
 
 * Clock control