Update doc for Idle command line options.

[terryjreedy]

BPO	25219
Nosy	@terryjreedy

^{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/terryjreedy'
closed_at = <Date 2018-12-11.22:27:04.190>
created_at = <Date 2015-09-23.06:34:44.626>
labels = ['3.8', 'expert-IDLE', 'type-bug', '3.7']
title = 'Update doc for Idle command line options.'
updated_at = <Date 2018-12-11.22:27:04.189>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2018-12-11.22:27:04.189>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-12-11.22:27:04.190>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2015-09-23.06:34:44.626>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 25219
keywords = []
message_count = 4.0
messages = ['251407', '251414', '328768', '331661']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'python-dev']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25219'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[terryjreedy]

idle.rst is either wrong or obsolete. Some options are missing and the notes are not now correct. I am editing so it matches code and help message in PyShell.py.

I believe there is a mismatch between code and help message with respect to interaction with configuration settings. But I need to do some tests to be sure.

[python-dev]

New changeset 80e92eba23e0 by Terry Jan Reedy in branch '2.7':
Issue bpo-25219: Update doc for Idle command line options.
https://hg.python.org/cpython/rev/80e92eba23e0

New changeset 97f3d7749d3f by Terry Jan Reedy in branch '3.4':
Issue bpo-25219: Update doc for Idle command line options.
https://hg.python.org/cpython/rev/97f3d7749d3f

[terryjreedy]

I should have said what mismatch there might be. It appears that further editing of idle.rst depends on checking whether there are errors in pyshell.usage_msg, which should be fixed first.

[terryjreedy]

Rather that leave this open indefinitely, I decided to close until a report or research says that more is needed.