doctest document says dict order is unstable

BPO	36599
Nosy	@rhettinger, @methane
Superseder	bpo-34839: doctest: Change example under warnings section

^{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 = None
closed_at = <Date 2019-04-12.06:21:28.285>
created_at = <Date 2019-04-11.10:11:10.712>
labels = ['3.7', '3.8', 'docs']
title = 'doctest document says dict order is unstable'
updated_at = <Date 2019-04-12.06:21:28.284>
user = 'https://github.com/methane'

bugs.python.org fields:

activity = <Date 2019-04-12.06:21:28.284>
actor = 'methane'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-04-12.06:21:28.285>
closer = 'methane'
components = ['Documentation']
creation = <Date 2019-04-11.10:11:10.712>
creator = 'methane'
dependencies = []
files = []
hgrepos = []
issue_num = 36599
keywords = []
message_count = 3.0
messages = ['339952', '340007', '340008']
nosy_count = 3.0
nosy_names = ['rhettinger', 'methane', 'docs@python']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '34839'
type = None
url = 'https://bugs.python.org/issue36599'
versions = ['Python 3.7', 'Python 3.8']