[docs] [issue31570] minor bug in documentataion relating to sending html email

[Henk-Jaap Wagenaar]

Changes by Henk-Jaap Wagenaar <superhenkjaap at gmail.com>:


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keywords: +patch
pull_requests: +3706
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31570>
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