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

[Brett Cannon]

Brett Cannon added the comment:

Yeah, there's actually a specific 'warning' directive which puts text in the docs in a red box to make it a full-blown warning which is what I thought you wanted, having it say "this is different than Python 2!". Having a sentence that just states how things are without referring to Python 2 is totally fine.

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<http://bugs.python.org/issue30535>
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