python -X options are not documented in the CLI --help

[pablogsal]

BPO	39427
Nosy	@vstinner, @pablogsal, @miss-islington
PRs	bpo-39427: Document -X opt options in the CLI --help and the man page #18131 [3.8] bpo-39427: Document -X opt options in the CLI --help and the man page (GH-18131) #18133 [3.7] bpo-39427: Document -X opt options in the CLI --help and the man page (GH-18131) #18134

^{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 = 'https://github.com/pablogsal'
closed_at = <Date 2020-02-23.20:51:42.519>
created_at = <Date 2020-01-22.22:26:44.727>
labels = ['interpreter-core', '3.7', '3.8', '3.9']
title = 'python -X options are not documented in the CLI --help'
updated_at = <Date 2020-02-23.20:51:42.518>
user = 'https://github.com/pablogsal'

bugs.python.org fields:

activity = <Date 2020-02-23.20:51:42.518>
actor = 'pablogsal'
assignee = 'pablogsal'
closed = True
closed_date = <Date 2020-02-23.20:51:42.519>
closer = 'pablogsal'
components = ['Interpreter Core']
creation = <Date 2020-01-22.22:26:44.727>
creator = 'pablogsal'
dependencies = []
files = []
hgrepos = []
issue_num = 39427
keywords = ['patch']
message_count = 3.0
messages = ['360516', '360526', '362537', '362538']
nosy_count = 3.0
nosy_names = ['vstinner', 'pablogsal', 'miss-islington']
pr_nums = ['18131', '18133', '18134']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue39427'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[pablogsal]

When running python --help there is no documentation on the -X opt options available. It just says:

-X opt : set implementation-specific option

without what 'opt' can be.

[miss-islington]

New changeset 41f0ef6 by Miss Islington (bot) (Pablo Galindo) in branch 'master':
bpo-39427: Document -X opt options in the CLI --help and the man page (GH-18131)
41f0ef6

[pablogsal]

New changeset 13951c7 by Pablo Galindo in branch '3.8':
[3.8] bpo-39427: Document -X opt options in the CLI --help and the man page (GH-18131) (GH-18133)
13951c7

[pablogsal]

New changeset 333b989 by Pablo Galindo in branch '3.7':
[3.7] bpo-39427: Document -X opt options in the CLI --help and the man page (GH-18131) (bpo-18134)
333b989