[docs] [issue18600] email.policy doc example passes 'policy' to as_string, but that doesn't work

[R. David Murray]

R. David Murray added the comment:

Committed with changes pointed out by Antoine (thank you Antoine).

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resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18600>
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