Add more constants to zlib module

[zhangyangyu]

BPO	32969
Nosy	@zhangyangyu, @miss-islington
PRs	bpo-32969: Expose some missing constants in zlib and fix the doc #5988 [3.7] bpo-32969: Expose some missing constants in zlib and fix the doc (GH-5988) #6012 [3.6] bpo-32969: Expose some missing constants in zlib and fix the doc (GH-5988) #6013

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-03-07.05:55:49.658>
created_at = <Date 2018-02-28.08:59:00.678>
labels = ['3.8', '3.7', 'library', 'docs']
title = 'Add more constants to zlib module'
updated_at = <Date 2018-03-07.05:55:49.657>
user = 'https://github.com/zhangyangyu'

bugs.python.org fields:

activity = <Date 2018-03-07.05:55:49.657>
actor = 'xiang.zhang'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-03-07.05:55:49.658>
closer = 'xiang.zhang'
components = ['Documentation', 'Library (Lib)']
creation = <Date 2018-02-28.08:59:00.678>
creator = 'xiang.zhang'
dependencies = []
files = []
hgrepos = []
issue_num = 32969
keywords = ['patch']
message_count = 4.0
messages = ['313053', '313371', '313372', '313373']
nosy_count = 3.0
nosy_names = ['docs@python', 'xiang.zhang', 'miss-islington']
pr_nums = ['5988', '6012', '6013']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue32969'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[zhangyangyu]

Inspired by #5511, zlib module in Python lacks some constants exposed by C zlib library, and some constants are not documented.

[zhangyangyu]

New changeset bc3f228 by Xiang Zhang in branch 'master':
bpo-32969: Expose some missing constants in zlib and fix the doc (GH-5988)
bc3f228

[miss-islington]

New changeset c4d77a6 by Miss Islington (bot) in branch '3.7':
bpo-32969: Expose some missing constants in zlib and fix the doc (GH-5988)
c4d77a6

[miss-islington]

New changeset 7592c0a by Miss Islington (bot) in branch '3.6':
bpo-32969: Expose some missing constants in zlib and fix the doc (GH-5988)
7592c0a