Add versionchanged notes for string.Formatter

[zhangyangyu]

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']

[zhangyangyu]

I propose to add versionchanged note about auto-numbering feature of string.Formatter, introduced in bpo-13598. It's quite confusing which version could I use the feature reading the doc. Also it's better to note in 2.7 the feature is not available.

Currently the doc gives me the feeling string.Formatter and str.format share the same feature and the auto-numbering feature is available in 2.7 and >3.1.

[zhangyangyu]

New changeset b9d8ad5 by Xiang Zhang in branch 'master':
bpo-33828: Add missing versionchanged note for string.Formatter. (GH-7668)
b9d8ad5

[miss-islington]

New changeset 29fdea5 by Miss Islington (bot) in branch '3.7':
bpo-33828: Add missing versionchanged note for string.Formatter. (GH-7668)
29fdea5

[miss-islington]

New changeset 439a9b6 by Miss Islington (bot) in branch '3.6':
bpo-33828: Add missing versionchanged note for string.Formatter. (GH-7668)
439a9b6

[zhangyangyu]

New changeset fc8ea20 by Xiang Zhang in branch '2.7':
[2.7] bpo-33828: Clarify auto-numbering is not available to string.Formatter. (GH-7668) (GH-7676)
fc8ea20

[zhangyangyu]

Thanks for the review, Eric. :-)