[docs] [issue30535] Explicitly note that meta_path is not empty

[Windson Yang]

Windson Yang <wiwindson at outlook.com> added the comment:

I created a PR for it. TBO, meta_path is not a good name since it doesn't contain any *path* at all.

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nosy: +Windson Yang

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue30535>
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