Programming FAQ about "What is the most efficient way to concatenate many strings together?" -- Improving the example

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-04-20.21:27:30.707>
labels = ['type-feature', '3.8', '3.9', 'docs']
title = 'Programming FAQ about "What is the most efficient way to concatenate many strings together?" -- Improving the example'
updated_at = <Date 2020-05-24.19:39:14.868>
user = 'https://github.com/Dominik1123'

bugs.python.org fields:

activity = <Date 2020-05-24.19:39:14.868>
actor = 'petdance'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2020-04-20.21:27:30.707>
creator = 'Dominik V.'
dependencies = []
files = []
hgrepos = []
issue_num = 40344
keywords = ['patch']
message_count = 7.0
messages = ['366887', '366888', '366891', '366898', '366899', '367606', '369821']
nosy_count = 5.0
nosy_names = ['rhettinger', 'docs@python', 'BTaskaya', 'petdance', 'Dominik V.']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue40344'
versions = ['Python 3.8', 'Python 3.9']