[docs] Reading a file one character at a time - section 7.2.1

[Julien Palard]

Hi William!

Thanks for taking the time to open a PR, welcome!

> Looks like the next step is to register on b.p.o., sign the CLA, and open a bug on b.p.o., is that correct?

I added labels on your PR to avoid having to write a NEWS entry and opening an issue, we don't do them for such little changes.

However the CLA is mandatory (legal thing).

-- 
Julien Palard
https://mdk.fr