[issue40838] inspect.getsourcefile documentation doesn't mention it can return None

[Nikita Sobolev]

Change by Nikita Sobolev <mail at sobolevn.me>:


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keywords: +patch
nosy: +sobolevn
nosy_count: 3.0 -> 4.0
pull_requests: +28775
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/30575

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40838>
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