[issue45991] Improve ambiguous docstrings in pkgutil

[Stanley]

Stanley <ostanley.lee at gmail.com> added the comment:

I feel like there might be some backwards compatibility issues if pkgutil wraps it like that, but similarly I'm not at all familiar with how common the package is used and whether it'd be fine to make that change, so I'll also differ judgement here.

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<https://bugs.python.org/issue45991>
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