IDLE: Update configdialog docstrings to reflect extension integration

BPO	32765
Nosy	@terryjreedy, @csabella
PRs	bpo-32765: Update configdialog docstrings to reflect new layout #5529 [3.7] bpo-32765: Update configdialog General tab create page docstring (GH-5529) #5537 [3.6] bpo-32765: Update configdialog General tab create page docstring (GH-5529) #5538

^{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 2018-02-05.00:06:15.206>
created_at = <Date 2018-02-04.16:55:44.101>
labels = ['expert-IDLE', 'type-bug', '3.8']
title = 'IDLE: Update configdialog docstrings to reflect extension integration'
updated_at = <Date 2018-02-05.00:06:41.465>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2018-02-05.00:06:41.465>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-02-05.00:06:15.206>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-02-04.16:55:44.101>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 32765
keywords = ['patch']
message_count = 5.0
messages = ['311606', '311625', '311627', '311628', '311629']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'cheryl.sabella']
pr_nums = ['5529', '5537', '5538']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32765'
versions = ['Python 3.8']