boards: nrf54l15dk: Add documentation about the emulated SoCs

The nRF54L15 DK can now be used to emulate its lesser siblings, the L05
and the L10. Document this in the board reference so that user are aware
of this fact.

Signed-off-by: Carles Cufi <[email protected]>

boards/nordic/nrf54l15dk/doc/index.rst

@@ -150,3 +150,41 @@ Test the nRF54L15 DK with a :zephyr:code-sample:`blinky` sample.
 
 .. _nRF54L15 website: https://www.nordicsemi.com/Products/nRF54L15
 .. _nRF54L15 documentation: https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/index.html
+
+.. _nrf54l15dk_nrf54l05:
+
+nRF54L05 emulation on nRF54L15 DK
+#################################
+
+Overview
+********
+
+The ``nrf54l15dk/nrf54l05`` board is a modified version of the :ref:`nrf54l15dk_nrf54l15`
+that enforces the limitations imposed by the nRF54L05 IC, which is a
+cost-reduced variant of the original nRF54L15. Since Nordic does not offer a
+development kit for the nRF54L05, you can use this board to develop for this
+IC while using the nRF54L15 Development Kit (PCA10156).
+
+See :ref:`nrf54l15dk_nrf54l15` for more information about the development board and
+`nRF54L05 website`_ for the official reference on the IC itself.
+
+.. _nRF54L05 website: https://www.nordicsemi.com/Products/nRF54L05
+
+.. _nrf54l15dk_nrf54l10:
+
+nRF54L10 emulation on nRF54L15 DK
+#################################
+
+Overview
+********
+
+The ``nrf54l15dk/nrf54l10`` board is a modified version of the :ref:`nrf54l15dk_nrf54l15`
+that enforces the limitations imposed by the nRF54L10 IC, which is a
+cost-reduced variant of the original nRF54L15. Since Nordic does not offer a
+development kit for the nRF54L10 you can use this board to develop for this
+IC while using the nRF54L15 Development Kit (PCA10156).
+
+See :ref:`nrf54l15dk_nrf54l15` for more information about the development board and
+`nRF54L10 website`_ for the official reference on the IC itself.
+
+.. _nRF54L10 website: https://www.nordicsemi.com/Products/nRF54L10