Improve Python Language Reference based on [Köhl 2020]

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-02-15.01:19:11.536>
labels = []
title = 'Improve Python Language Reference based on [K\xc3\xb6hl 2020]'
updated_at = <Date 2022-02-24.02:16:35.889>
user = 'https://github.com/gvanrossum'

bugs.python.org fields:

activity = <Date 2022-02-24.02:16:35.889>
actor = 'JelleZijlstra'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2022-02-15.01:19:11.536>
creator = 'gvanrossum'
dependencies = []
files = []
hgrepos = []
issue_num = 46754
keywords = []
message_count = 4.0
messages = ['413275', '413863', '413865', '413873']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'JelleZijlstra', 'corona10', 'brandtbucher']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue46754'
versions = []