[issue45994] Add simple usage to email module

[Eric V. Smith]

New submission from Eric V. Smith <eric at trueblade.com>:

What sort of usage example would help you?

Is https://docs.python.org/3/library/email.examples.html lacking something?

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nosy: +eric.smith

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45994>
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