Automatically tabulate module contents in the docs

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-01-16.22:05:46.796>
labels = ['3.8', 'type-feature', '3.7', '3.9', 'docs']
title = 'Automatically tabulate module contents in the docs'
updated_at = <Date 2020-01-17.08:13:58.250>
user = 'https://github.com/alexchandel'

bugs.python.org fields:

activity = <Date 2020-01-17.08:13:58.250>
actor = 'xtreak'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2020-01-16.22:05:46.796>
creator = 'alexchandel'
dependencies = []
files = []
hgrepos = []
issue_num = 39364
keywords = []
message_count = 1.0
messages = ['360148']
nosy_count = 3.0
nosy_names = ['docs@python', 'mdk', 'alexchandel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39364'
versions = ['Python 2.7', 'Python 3.5', 'Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9']