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

[Xavier Morel]

Xavier Morel added the comment:

And it turns out the change was noted in the Python 3.3 release notes[0] though not all the consequences were spelled out (and the meta_path and path_hooks documentations were not changed)

[0] https://docs.python.org/3/whatsnew/3.3.html#visible-changes

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