Argparse: Add a "display" arg

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-10-12.21:18:16.139>
labels = ['type-feature', 'library', '3.9', '3.10']
title = 'Argparse: Add a "display" arg'
updated_at = <Date 2020-10-14.19:40:18.135>
user = 'https://github.com/ThatXliner'

bugs.python.org fields:

activity = <Date 2020-10-14.19:40:18.135>
actor = 'ThatXliner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2020-10-12.21:18:16.139>
creator = 'ThatXliner'
dependencies = []
files = []
hgrepos = []
issue_num = 42023
keywords = []
message_count = 10.0
messages = ['378526', '378599', '378601', '378632', '378644', '378646', '378647', '378649', '378650', '378651']
nosy_count = 3.0
nosy_names = ['rhettinger', 'paul.j3', 'ThatXliner']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42023'
versions = ['Python 3.9', 'Python 3.10']