Adds missing code-sample directive to the remaining samples in
`samples/subsys` that didn't use it yet in preparation for upcoming
changes to the Zephyr documentation that will be leveraging the provided
description and metadata.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
Implemented a sample that shows configuration and basic usage of monitor
mode debugging feature.
Signed-off-by: Piotr Jasiński <piotr.jasinski@nordicsemi.no>