doc: release-notes-4.1: Update 4.1 note

Remove USB, RTC enable note for NXP frdm_mcxn236

Signed-off-by: Neil Chen <[email protected]>

Author: NeilChen93

doc/releases/release-notes-4.1.rst

@@ -107,7 +107,6 @@ Boards & SoC Support
 
   * All HWMv1 board name aliases which were added as deprecated in v3.7 are now removed
     (:github:`82247`).
-  * Enabled USB, RTC on NXP ``frdm_mcxn236``
 
 * Added support for the following shields: