[docs] [issue15677] Gzip/zlib allows for compression level=0

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

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nosy: +nadeem.vawda, serhiy.storchaka
stage: needs patch -> commit review
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15677>
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