update the first use case to reflect that it works

The first use case works with the current implementation. It is updated
to remove the warning and the syntax is adapted to match the
reality. Instead of a laptop, it is suggested that the test is done on a
virtual machine because it is much more likely.

Change-Id: I7fafb2a6d06eb146b6a2407fb20fdfc4846889f9
Signed-off-by: Loic Dachary <loic@dachary.org>