[docs] [issue25496] tarfile: Default value for compresslevel is not documented

[Martin Panter]

Martin Panter added the comment:

For gzip compression, there is also a proposal to change the default: Issue 26253.

Anyway, the patch looks good for now.

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nosy: +martin.panter
stage: needs patch -> patch review
versions: +Python 2.7 -Python 3.4

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<http://bugs.python.org/issue25496>
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