doc: Add description of release artifacts

Describing various release artifacts.

Signed-off-by: Tommi Rantanen <tommi.rantanen@nordicsemi.no>

Author: trantanen

doc/release_notes.rst

@@ -8,3 +8,35 @@ Release notes
    :depth: 2
 
 For all the notable changes to the |SM|, see the `release on GitHub <github_release_>`_.
+
+Release artifacts
+*****************
+
+The |SM| repository contains the following release artifacts:
+
+.. list-table::
+   :widths: auto
+   :header-rows: 1
+
+   * - Release artifact
+     - Description
+   * - ``serial_modem_{VERSION}_nrf9151dk_normal.hex``
+     - Normal build for nRF9151 DK to operate with PC.
+   * - ``serial_modem_{VERSION}_nrf9151dk_normal_mtrace.hex``
+     - Normal build with modem traces and application debug logging enabled for nRF9151 DK to operate with PC.
+   * - ``serial_modem_{VERSION}_nrf9151dk_extmcu.hex``
+     - External MCU build for nRF9151 DK including PPP and CMUX support.
+   * - ``serial_modem_{VERSION}_nrf9151dk_extmcu_mtrace.hex``
+     - External MCU build with modem traces and application debug logging enabled for nRF9151 DK.
+   * - ``sm_at_client_shell_{VERSION}_nrf54l15dk.hex``
+     - AT client shell build for nRF54L15 DK host that can be used as an external MCU with ``serial_modem_{VERSION}_nrf9151dk_extmcu*.hex``.
+       See :ref:`uart_configuration` for pin wiring.
+   * - ``sm_ppp_shell_{VERSION}_nrf54l15dk.hex``
+     - PPP shell build for nRF54L15 DK host that can be used as an external MCU with ``serial_modem_{VERSION}_nrf9151dk_extmcu*.hex``.
+       See :ref:`uart_configuration` for pin wiring.
+
+.. note::
+
+   Do not use ``_mtrace`` variants for power measurements.
+   The trace UART with HW flow control enabled due to RTT application logging has approximately 700 uA overhead on the power consumption.
+