2to3 docs: example of fix for duplicates in second argument of isinstance has superfluous parentheses

[eli-b]

BPO	30456
Nosy	@berkerpeksag, @eli-b
PRs	bpo-30456: DOC: 2to3: fix example for duplicates in second argument of isinstance #1699 [3.6] bpo-30456: Clarify example for duplicates in second argument of isinstance (GH-1699) #4531
Files	2to3.rst

^{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 2017-11-23.20:28:32.529>
created_at = <Date 2017-05-24.12:38:00.434>
labels = ['type-bug', '3.7', 'docs']
title = '2to3 docs: example of fix for duplicates in second argument of isinstance has superfluous parentheses'
updated_at = <Date 2017-11-23.20:28:32.527>
user = 'https://github.com/eli-b'

bugs.python.org fields:

activity = <Date 2017-11-23.20:28:32.527>
actor = 'berker.peksag'
assignee = 'docs@python'
closed = True
closed_date = <Date 2017-11-23.20:28:32.529>
closer = 'berker.peksag'
components = ['Documentation']
creation = <Date 2017-05-24.12:38:00.434>
creator = 'Eli_B'
dependencies = []
files = ['46894']
hgrepos = []
issue_num = 30456
keywords = ['patch']
message_count = 4.0
messages = ['294351', '298923', '306857', '306858']
nosy_count = 3.0
nosy_names = ['docs@python', 'berker.peksag', 'Eli_B']
pr_nums = ['1699', '4531']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30456'
versions = ['Python 3.6', 'Python 3.7']

[eli-b]

The documentation says isinstance(x, (int, int)) would be fixed to isinstance(x, (int)). The fix is actually isinstance(x, int).

I propose the following text instead:
"
2to3fixer:: isinstance

Fixes duplicate types in the second argument of :func:`isinstance`. For example, isinstance(x, (int, int)) is converted to isinstance(x, int) and isinstance(x, (int, float, int)) is converted to isinstance(x, (int, float)).
"

[berkerpeksag]

New changeset 26248ef by Berker Peksag (Eli Boyarski) in branch 'master':
bpo-30456: Clarify example for duplicates in second argument of isinstance (GH-1699)
26248ef

[berkerpeksag]

New changeset a645b23 by Berker Peksag in branch '3.6':
bpo-30456: Clarify example for duplicates in second argument of isinstance (GH-1699)
a645b23

[berkerpeksag]

Looks like I forgot to backport this 3.6 branch. Now it's done. Thanks, Eli.