In a manual for an addon pcb to my RPi3, RaspBee, in the manual it say that I need to

disable commandline over serial:
$ sudo raspi-config,
Advanced Options - ?Serial - ?Disable Commandline over Serial

I don't have that in my raspi-config, I'm on the latest rasbian, jiessi
So I wonder how can I disable it now.. Disable Commandline over Serial