roms: List and describe the Makefile 'clean' rule

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190506141923.12183-3-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
1 file changed