doc: Update changelog

Information on generating bootconf.hex when building project
with NSIB, for nRF54L.

Co-authored-by: Francesco Domenico Servidio <francesco.servidio@nordicsemi.no>
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>

Author: de-nordic

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -65,7 +65,7 @@ Developing with nRF70 Series
 Developing with nRF54L Series
 =============================
 
-|no_changes_yet_note|
+* Updated builds without Partition Manager to generate the :file:`bootconf.hex` file when |NSIB| is used as the bootloader.
 
 Developing with nRF54H Series
 =============================