[issue24277] Take the new email package features out of provisional status

[Roundup Robot]

Roundup Robot added the comment:

New changeset ad297312a478 by R David Murray in branch 'default':
#24277: Fix 3.4 whats new link broken by email doc changes.
https://hg.python.org/cpython/rev/ad297312a478

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<http://bugs.python.org/issue24277>
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