Update idlelib.help.copy_string docstring

[terryjreedy]

BPO	35088
Nosy	@terryjreedy, @miss-islington
PRs	bpo-35088: Update idlelib.help.copy_string docstring #10164 [3.7] bpo-35088: Update idlelib.help.copy_string docstring (GH-10164) #10167 [3.6] bpo-35088: Update idlelib.help.copy_string docstring (GH-10164) #10168

^{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 2018-10-28.07:35:36.490>
created_at = <Date 2018-10-28.04:48:58.559>
labels = ['3.8', 'expert-IDLE', 'type-bug', '3.7']
title = 'Update idlelib.help.copy_string docstring'
updated_at = <Date 2018-10-28.07:35:36.490>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2018-10-28.07:35:36.490>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-10-28.07:35:36.490>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-10-28.04:48:58.559>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 35088
keywords = ['patch']
message_count = 4.0
messages = ['328671', '328673', '328678', '328679']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'miss-islington']
pr_nums = ['10164', '10167', '10168']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35088'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[terryjreedy]

The current docstring still refers to hg and forward merging.

[terryjreedy]

New changeset 2b555fc by Terry Jan Reedy in branch 'master':
bpo-35088: Update idlelib.help.copy_string docstring (bpo-10164)
2b555fc

[miss-islington]

New changeset 593af34 by Miss Islington (bot) in branch '3.7':
bpo-35088: Update idlelib.help.copy_string docstring (GH-10164)
593af34

[miss-islington]

New changeset 0e6329d by Miss Islington (bot) in branch '3.6':
bpo-35088: Update idlelib.help.copy_string docstring (GH-10164)
0e6329d