[docs] [issue31720] msilib.MSIError is spelled MsiError in documentation

[Tzu-ping Chung]

Change by Tzu-ping Chung <uranusjr at gmail.com>:


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keywords: +patch
pull_requests: +3887
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31720>
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