[docs] [issue35843] importlib.util docs for namespace packages innaccurate

[Anthony Sottile]

Change by Anthony Sottile <asottile at umich.edu>:


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keywords: +patch, patch, patch
pull_requests: +11529, 11530, 11531
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35843>
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