[docs] I was taken aback a little by the wording on pg. 13

[Julien Palard]

Hi Loren, thanks for taking time to give us this feedback!

What do you think of:
> Note how the character at the start position is always included, and the one at the end is always excluded.
?

Do you have any better wordings in mind?
--
Julien Palard
https://mdk.fr
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