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

[Xavier Morel]

Xavier Morel added the comment:

> 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…).

Yeah that's basically what I meant, talking about a "warning" in python 3 may have been the wrong wording or given an incorrect impression, sorry about that.

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