I would not insist of starting with 1 instead of 0 (I follow your arguments here), but perhaps it would be nice if it would behave the same way in both chapters. The first fibonacci number examples in https://docs.python.org/3/tutorial/introduction.html#first-steps-towards-programming start with 1.

There are three examples here, in the first,

while b < 10:
    print(b)

should change to

while a < 10:
    print(a)

The output of this first example would have an additional 0:
0
1
1
...

And in the third example

while b < 1000:
    print(b, end=',')

should change to

while a < 1000:
    print(a, end=',')

where the output of this third example would change from

1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,

to

0,1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,