doc: changelog: mention nRF54LM20 support in Bluetooth HID samples

Added information to the changelog that describes the nRF54LM20 DK
support in the Bluetooth HID samples.

Ref: NCSDK-35053

Signed-off-by: Kamil Piszczek <[email protected]>

Author: kapi-no

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

@@ -240,7 +240,11 @@ Amazon Sidewalk samples
 Bluetooth samples
 -----------------
 
-|no_changes_yet_note|
+* Added experimental support for the :zephyr:board:`nrf54lm20dk` board in the following samples:
+
+  * :ref:`bluetooth_central_hids`
+  * :ref:`peripheral_hids_keyboard`
+  * :ref:`peripheral_hids_mouse`
 
 Bluetooth Mesh samples
 ----------------------