[docs] [issue5784] raw deflate format and zlib module

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0df93ab07a8f by Martin Panter in branch '2.7':
Issue #5784: Cannot test wbits=0 unless we know we have zlib v1.2.3.5
https://hg.python.org/cpython/rev/0df93ab07a8f

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<http://bugs.python.org/issue5784>
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