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

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset c4d77a661138debbbe584b8b08410afc8719a9b1 by Miss Islington (bot) in branch '3.7':
bpo-32969: Expose some missing constants in zlib and fix the doc (GH-5988)
https://github.com/python/cpython/commit/c4d77a661138debbbe584b8b08410afc8719a9b1


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nosy: +miss-islington

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