This commit uses the new .. zephyr:code-sample-category directive to
categorize code samples across the tree.
Updates existing legacy references to manually defined targets to now
use :zephyr:code-sample-category: role instead.
Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
This looks a bit lost in its own USB-C chapter,
move it to USB under the Power Delivery heading.
Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
