[docs] [issue34203] documentation: recommend Python 3 over 2 in faq

[Gus Goulart]

Change by Gus Goulart <augusto at goulart.me>:


----------
keywords: +patch
pull_requests: +9180
stage: needs patch -> patch review

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34203>
_______________________________________