IDLE doc improvements

[terryjreedy]

BPO	37825
Nosy	@terryjreedy, @taleinat

^{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 = None
created_at = <Date 2019-08-11.16:54:19.592>
labels = ['expert-IDLE', '3.7', '3.8', '3.9']
title = 'IDLE doc improvements'
updated_at = <Date 2019-09-10.02:45:02.350>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2019-09-10.02:45:02.350>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2019-08-11.16:54:19.592>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 37825
keywords = []
message_count = 5.0
messages = ['349399', '349427', '349435', '349436', '351565']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'taleinat']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue37825'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[terryjreedy]

1. Headings: Sections should be titlecased, subsections not. This is especially needed now that they are not numbered.

2. Python Shell subsection. Revise 'paste', maybe move. SyntaxWarnings are SyntaxErrors. Explain Restart.

3. Any other pending changes I include.

[terryjreedy]

Because the scope of SyntaxWarnings has been expanded to code that must be run, they should no longer be turned into errors, so this should not be added to the doc. See bpo-34857.

[terryjreedy]

4. Completions subsection: fix this garbled sentence. "Names in an Editor window which are not via __main__ and sys.modules will not be found." Check 2.6 help.txt from whence it likely came.

[terryjreedy]

The garble was in help.txt as copied into idle.rst in bpo-5066. I will have to figure out the meaning.

[terryjreedy]

5 Delete use of 'extension' referring to converted features.
"If you don’t like the ACW popping up unbidden, simply make the delay longer or disable the extension." Remove ' or ...'