[docs] [issue16071] fix link to email.message.Message in mailbox docs

[Chris Jerdonek]

Chris Jerdonek added the comment:

It can take up to 24 hours for the changes to show up on the web site.  They are regenerated at least once per day.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16071>
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