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>
Utilize a code spell-checking tool to scan for and correct spelling errors
in all files within the doc/services directory.
Signed-off-by: Pisit Sawangvonganan <pisit@ndrsolution.com>