Add versionchanged notes for string.Formatter

BPO	33828
Nosy	@ericvsmith, @zhangyangyu, @miss-islington
PRs	bpo-33828: Add missing versionchanged note for string.Formatter. #7668 [3.7] bpo-33828: Add missing versionchanged note for string.Formatter. (GH-7668) #7674 [3.6] bpo-33828: Add missing versionchanged note for string.Formatter. (GH-7668) #7675 [2.7] bpo-33828: Add missing versionchanged note for string.Formatter. (GH-7668) #7676

^{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 2018-06-13.02:40:48.374>
created_at = <Date 2018-06-11.08:33:19.610>
labels = ['3.8', 'type-feature', '3.7', 'docs']
title = 'Add versionchanged notes for string.Formatter'
updated_at = <Date 2018-06-13.02:40:48.367>
user = 'https://github.com/zhangyangyu'

bugs.python.org fields:

activity = <Date 2018-06-13.02:40:48.367>
actor = 'xiang.zhang'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-06-13.02:40:48.374>
closer = 'xiang.zhang'
components = ['Documentation']
creation = <Date 2018-06-11.08:33:19.610>
creator = 'xiang.zhang'
dependencies = []
files = []
hgrepos = []
issue_num = 33828
keywords = ['patch']
message_count = 6.0
messages = ['319284', '319418', '319419', '319420', '319421', '319422']
nosy_count = 4.0
nosy_names = ['eric.smith', 'docs@python', 'xiang.zhang', 'miss-islington']
pr_nums = ['7668', '7674', '7675', '7676']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue33828'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']