[docs] [issue21479] Document TarFile.open() as a classmethod

[Berker Peksag]

New submission from Berker Peksag:

The patch also updates the signature of TarFile.open().

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assignee: docs at python
components: Documentation
files: tarfile-open-classmethod.diff
keywords: patch
messages: 218323
nosy: berker.peksag, docs at python, serhiy.storchaka
priority: normal
severity: normal
stage: patch review
status: open
title: Document TarFile.open() as a classmethod
versions: Python 2.7, Python 3.4, Python 3.5
Added file: http://bugs.python.org/file35225/tarfile-open-classmethod.diff

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<http://bugs.python.org/issue21479>
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