Add docs and tests for ordering in Counter. [no behavior change]

BPO	36057
Nosy	@rhettinger, @eamanu
PRs	bpo-36057 Update docs and tests for ordering in collections.Counter [no behavior change] #11962 [3.7] bpo-36057 Update docs and tests for ordering in collections.Counter [no behavior change] (GH-11962) #11979

^{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 2019-02-21.17:31:03.892>
created_at = <Date 2019-02-21.00:10:05.346>
labels = ['3.8', '3.7', 'tests', 'docs']
title = 'Add docs and tests for ordering in Counter.  [no behavior change]'
updated_at = <Date 2019-02-21.17:31:03.892>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2019-02-21.17:31:03.892>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = <Date 2019-02-21.17:31:03.892>
closer = 'rhettinger'
components = ['Documentation', 'Tests']
creation = <Date 2019-02-21.00:10:05.346>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 36057
keywords = ['patch']
message_count = 6.0
messages = ['336156', '336157', '336160', '336162', '336166', '336240']
nosy_count = 2.0
nosy_names = ['rhettinger', 'eamanu']
pr_nums = ['11962', '11979']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36057'
versions = ['Python 3.7', 'Python 3.8']