Fix the probe handling tutorial

[zm711]

If you do

>>> a_dict = {0: 'a', 1: 'b'}

>>> a, b = a_dict

>>>print(a)
0
>>>print(b)
1

which means people will do this wrong. I think maybe we switched the default from list to dict as some point. So I added a note in the explanation that you can choose the output and then fixed the example for the dict output instead.

[h-mayorquin]

LGTM.

[samuelgarcia]

merci. This was very bad.