doc: Added instruction for blob fetching

Added in the documentation for the DA1469x based kit to fetch the
binary blobs.

Signed-off-by: Ben Lauret <[email protected]>

Author: blauret

boards/renesas/da14695_dk_usb/doc/index.rst

@@ -45,6 +45,23 @@ The pin connections are as follows:
 * UART RX, connected to J-Link serial = P0.08
 * UART TX, connected to J-Link serial = P0.09
 
+System requirements
+*******************
+
+Prerequisites
+=============
+
+Renesas HAL requires Bluetooth binary blobs in order work. Run the command
+below to retrieve those files.
+
+.. code-block:: console
+
+   west blobs fetch hal_renesas
+
+.. note::
+
+   It is recommended running the command above after :file:`west update`.
+
 Programming and Debugging
 *************************
 

boards/renesas/da1469x_dk_pro/doc/index.rst

@@ -47,6 +47,23 @@ The pin connections are as follows:
 * UART RX, via USB1 on motherboard = P0.08
 * UART TX, via USB1 on motherboard = P0.09
 
+System requirements
+*******************
+
+Prerequisites
+=============
+
+Renesas HAL requires Bluetooth binary blobs in order work. Run the command
+below to retrieve those files.
+
+.. code-block:: console
+
+   west blobs fetch hal_renesas
+
+.. note::
+
+   It is recommended running the command above after :file:`west update`.
+
 Programming and Debugging
 *************************