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

[R. David Murray]

R. David Murray added the comment:

Two words and a tilde.  But there were also a number of other places where the links were broken.  Hopefully I caught them all.

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

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