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

[Roundup Robot]

Roundup Robot added the comment:

New changeset aad3cec524f9 by R David Murray in branch '2.7':
#16071: fix email.message links in the mailbox docs.
http://hg.python.org/cpython/rev/aad3cec524f9

----------

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