[issue16813] use paths relative to CPython root in documentation building instructions

[Sandro Tosi]

Sandro Tosi added the comment:

> Out of curiosity, does anyone know if the following works on all or most systems?
>
> $ open _build/html/index.html

it doesn't work on my Debian system:

$ open _build/html/index.html
Couldn't get a file descriptor referring to the console

as open is a link to "openvt - start a program on a new virtual terminal (VT)."

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nosy: +sandro.tosi

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