IDLE: revise calltip doc

BPO	35764
Nosy	@terryjreedy, @miss-islington
PRs	bpo-35764: Rewrite the IDLE Calltips doc section #22363 [3.9] bpo-35764: Rewrite the IDLE Calltips doc section (GH-22363) #22364 [3.8] bpo-35764: Rewrite the IDLE Calltips doc section (GH-22363) #22365

^{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 2020-09-22.18:36:28.829>
created_at = <Date 2019-01-17.20:18:44.786>
labels = ['expert-IDLE', 'type-bug', '3.8', '3.9', '3.10']
title = 'IDLE: revise calltip doc'
updated_at = <Date 2020-09-22.18:36:28.828>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2020-09-22.18:36:28.828>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2020-09-22.18:36:28.829>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2019-01-17.20:18:44.786>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 35764
keywords = ['patch']
message_count = 5.0
messages = ['333898', '377336', '377342', '377344', '377345']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'miss-islington']
pr_nums = ['22363', '22364', '22365']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35764'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']