Add multisort recipe to sorting docs

[tirkarthi]

BPO	35020
Nosy	@tim-one, @rhettinger, @tirkarthi
PRs	bpo-35020: Link to sorting examples from list.sort() #9931 Remove ">>>" from testsetup. #10017

^{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/rhettinger'
closed_at = <Date 2018-10-20.21:40:18.999>
created_at = <Date 2018-10-18.17:13:38.506>
labels = ['3.8', 'type-feature', '3.7', 'docs']
title = 'Add multisort recipe to sorting docs'
updated_at = <Date 2018-10-20.23:46:09.642>
user = 'https://github.com/tirkarthi'

bugs.python.org fields:

activity = <Date 2018-10-20.23:46:09.642>
actor = 'benjamin.peterson'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2018-10-20.21:40:18.999>
closer = 'rhettinger'
components = ['Documentation']
creation = <Date 2018-10-18.17:13:38.506>
creator = 'xtreak'
dependencies = []
files = []
hgrepos = []
issue_num = 35020
keywords = ['patch']
message_count = 2.0
messages = ['327988', '328180']
nosy_count = 4.0
nosy_names = ['tim.peters', 'rhettinger', 'docs@python', 'xtreak']
pr_nums = ['9931', '10017']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue35020'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[tirkarthi]

This issue handles the below :

1. Adding a link to sorting HOWTO from list.sort docs as per msg327901
2. Adding multisort recipe to sorting HOWTO with an example as per msg327925.

I have raised a PR (GH-9931) for #1 but the bpo-35010 was closed and hence I will link to this issue. I would also suggest adding single pass sorting example

multisort recipe : https://mail.python.org/pipermail/python-ideas/2016-October/043045.html
single pass recipe : https://mail.python.org/pipermail/python-ideas/2016-October/043126.html

Since English is not my first language feedback welcome on the wording.

Thanks

[rhettinger]

New changeset 890a4b9 by Raymond Hettinger (Xtreak) in branch 'master':
bpo-35020: Link to sorting examples from list.sort() (GH-9931)
890a4b9