[docs] [issue27633] Doc: Add missing version info to email.parser

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3f2e37e705d3 by Berker Peksag in branch '3.5':
Issue #27633: Fix usage of versionchanged directive in email.parser.rst
https://hg.python.org/cpython/rev/3f2e37e705d3

New changeset 8224ad99842e by Berker Peksag in branch 'default':
Issue #27633: Merge from 3.5
https://hg.python.org/cpython/rev/8224ad99842e

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nosy: +python-dev

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