Describe the samples using code-sample directive 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>
The samples had a _iso suffix, but the other ISO samples
prefix iso_.
Renames the central and peripheral sample so that they
prefix iso_ rather than suffix _iso.
Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>