IDLE: document search (find) and replace better

[terryjreedy]

BPO	45199
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 = None
created_at = <Date 2021-09-14.22:13:34.128>
labels = ['expert-IDLE', 'type-feature', '3.11']
title = 'IDLE: document search (find) and replace better'
updated_at = <Date 2021-09-14.22:13:34.128>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2021-09-14.22:13:34.128>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2021-09-14.22:13:34.128>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 45199
keywords = []
message_count = 1.0
messages = ['401801']
nosy_count = 1.0
nosy_names = ['terry.reedy']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45199'
versions = ['Python 3.11']

[terryjreedy]

The doc currently just says that the Search, File Search, and Search&Replace dialogs exist for the corresponding menu entries.
Add a short section in "Editing and navigation" to say more.

1. Any selection becomes search target, except that S&R is buggy.
2. Search is only within lines. .* and \n do not match \n even with RE.
3. [x]RE uses Python re module, not tcl re. It applies to replace also. So if target RE has capture groups, \1 (and \gname? test) in replacement works.(match.expand(repl))
4. Refer to re chapter and RegularExpression HOWTO.