Update Multiple inheritance in basics.rst

[bcarmo-caio]

$ python --version
Python 3.9.18

$ pip freeze | grep colander
colander==2.0

[bcarmo-caio]

Or perhaps

class Three(Two, One):

was meant. And then the output matches.

[tseaver]

After I get the CI unstuck, I'll look more closely at the output here.

[tseaver]

Thanks very much for the patch! I've fixed the CI issue already, so this one should be ready to merge once the note I suggested is added.

[tseaver]

I think we need to add an explanatory comment that the order of the children in the output is governed by Python's __mro__, e.g.

Suggested change

	.. note::
	The order of the children in the output above might seem suprising:
	it is governed by how Python's multiple-inheritance works (the
	``__mro__`` order).