bpo-38534: Replace wrong KB number references

[benedwards14]

This is my first contribution to CPython.

I'm fixing the issue from:
https://bugs.python.org/issue38534

https://bugs.python.org/issue38534

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

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@benedwards14

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[benedwards14]

Have signed the CLA, and am waiting for approval

[miss-islington]

Thanks @benedwards14 for the PR, and @zooba for merging it 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[zooba]

Thanks!

[bedevere-bot]

GH-16969 is a backport of this pull request to the 3.8 branch.