[issue724459] Add documentation about line endings in email messages.

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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components: +email -Documentation
priority: normal -> low
versions: +Python 3.3 -Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue724459>
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