doc: release-notes: document manufacturer data scan filter

Add changelog entries for the new scan filter and Kconfig options.

Signed-off-by: Martynas Smilingis <martynas.smilingis@nordicsemi.no>

Author: PizzaAllTheWay

doc/nrf-bm/release_notes/release_notes_changelog.rst

@@ -222,7 +222,12 @@ Libraries
 * :ref:`lib_ble_scan` library:
 
    * The library is now supported.
-   * Added the :c:struct:`ble_scan_filter_data` structure as input to the :c:func:`ble_scan_filter_add` function.
+   * Added:
+
+      * The :c:struct:`ble_scan_filter_data` structure as input to the :c:func:`ble_scan_filter_add` function.
+      * Support for filtering by manufacturer-specific data via the :c:macro:`BLE_SCAN_MANUFACTURER_DATA_FILTER` filter type.
+      * The :kconfig:option:`CONFIG_BLE_SCAN_MANUFACTURER_DATA_COUNT` and :kconfig:option:`CONFIG_BLE_SCAN_MANUFACTURER_DATA_MAX_LEN` Kconfig options to configure the manufacturer data filter capacity and maximum payload length.
+
    * Updated:
 
       * The functions to use the ``uint32_t`` type instead of ``int`` when returning nrf_errors.