doc/nrf/../changelog: record on mcuboot boot-record fix

Added recoord on fix in sdk-mcuboot bootloader info
sharing mechanism.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

Author: nvlsianpu

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

@@ -527,7 +527,8 @@ The code for integrating MCUboot into |NCS| is located in the :file:`ncs/nrf/mod
 
 The following list summarizes both the main changes inherited from upstream MCUboot and the main changes applied to the |NCS| specific additions:
 
-|no_changes_yet_note|
+* Fixed a possible infinite loop in the bootloader information sharing procedure when the Kconfig options :kconfig:option:`CONFIG_BOOT_SHARE_DATA_BOOTINFO` and :kconfig:option:`CONFIG_MCUBOOT_HW_DOWNGRADE_PREVENTION` are enabled.
+  Iterating boot-info security counters could spin forever if the :c:func:`boot_nv_security_counter_get` function failed for an image index (for example, backends that expose only one NV counter when :kconfig:option:`CONFIG_BOOT_IMAGE_NUMBER` is greater than one).
 
 Zephyr
 ======