[docs] [issue30535] Warn that meta_path is not empty

[Antoine Pitrou]

Antoine Pitrou added the comment:

Le 02/06/2017 à 13:21, Xavier Morel a écrit :
> 
> I spent a few hours trying to understand why our import hooks did not work correctly anymore in 3.5, and I never even considered printing sys.meta_path in an open interpreter, I realised the behavioural change because I ended up printing meta_path after the addition of our custom hooks to make sure they were actually there.

Fair enough. So we can just add a sentence informing readers that
`meta_path`, by default, holds entries to handle the standard kinds of
modules (.py files, extension modules...).

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