release-notes: add phyBOARD-Nash i.MX93

Add entry to release-notes as a follow-up to #76975.

Signed-off-by: Jonas Remmert <[email protected]>

Author: jonas-rem

doc/releases/release-notes-4.0.rst

@@ -158,6 +158,8 @@ Boards & SoC Support
 
 * Added support for these boards:
 
+  * Added support for :ref:`PHYTEC phyBOARD-Nash <phyboard_nash>`: ``phyboard_nash``.
+
 * Made these board changes:
 
   * :ref:`native_posix<native_posix>` has been deprecated in favour of