[good first issue] Align version changed for truncate in io module

BPO	36006
Nosy	@Mariatta, @eamanu, @csabella, @miss-islington
PRs	bpo-36006: Fix versionchanged directive alignment in io module documentation #11881 [3.7] bpo-36006: Fix versionchanged directive alignment in io module documentation (GH-11881) #11882

^{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 2019-02-15.18:52:06.165>
created_at = <Date 2019-02-15.18:08:32.875>
labels = ['easy', '3.8', 'type-feature', '3.7', 'docs']
title = '[good first issue] Align version changed for truncate in io module'
updated_at = <Date 2019-02-15.19:09:40.665>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2019-02-15.19:09:40.665>
actor = 'miss-islington'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-02-15.18:52:06.165>
closer = 'Mariatta'
components = ['Documentation']
creation = <Date 2019-02-15.18:08:32.875>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 36006
keywords = ['patch', 'easy']
message_count = 5.0
messages = ['335633', '335634', '335636', '335637', '335638']
nosy_count = 5.0
nosy_names = ['docs@python', 'Mariatta', 'eamanu', 'cheryl.sabella', 'miss-islington']
pr_nums = ['11881', '11882']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36006'
versions = ['Python 3.7', 'Python 3.8']