[issue25219] Update doc for Idle command line argument.

[Terry J. Reedy]

New submission from Terry J. Reedy:

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.

----------
messages: 251407
nosy: terry.reedy
priority: normal
severity: normal
stage: needs patch
status: open
title: Update doc for Idle command line argument.
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25219>
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