[docs] [issue32969] Add more constants to zlib module

[Xiang Zhang]

Xiang Zhang <angwerzx at 126.com> added the comment:


New changeset bc3f2289b9007396bfb7f986bee477b6176c1822 by Xiang Zhang in branch 'master':
bpo-32969: Expose some missing constants in zlib and fix the doc (GH-5988)
https://github.com/python/cpython/commit/bc3f2289b9007396bfb7f986bee477b6176c1822


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<https://bugs.python.org/issue32969>
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