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

Serhiy Storchaka added the comment: LGTM. ---------- nosy: +nadeem.vawda, serhiy.storchaka stage: needs patch -> commit review versions: +Python 3.4 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue15677> _______________________________________