Adds missing code-sample directive to the Hello World sample 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>
Reorganize the EEPROM periheral documentation to make room for subpages
with additional details. Add a page describing the EEPROM shell module.
Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>