python3.8 a1 - docs build requires sphinx 1.7 but uses a 1.8 feature

BPO	36007
Nosy	@asottile, @Mariatta, @miss-islington
PRs	bpo-36007: Bump minimum sphinx version to 1.8 #11887

^{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 2019-02-15.23:41:42.703>
created_at = <Date 2019-02-15.22:48:04.636>
labels = ['build', '3.8', 'docs']
title = 'python3.8 a1 - docs build requires sphinx 1.7 but uses a 1.8 feature'
updated_at = <Date 2019-02-15.23:51:48.223>
user = 'https://github.com/asottile'

bugs.python.org fields:

activity = <Date 2019-02-15.23:51:48.223>
actor = 'Mariatta'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-02-15.23:41:42.703>
closer = 'Mariatta'
components = ['Build', 'Documentation']
creation = <Date 2019-02-15.22:48:04.636>
creator = 'Anthony Sottile'
dependencies = []
files = []
hgrepos = []
issue_num = 36007
keywords = ['patch']
message_count = 4.0
messages = ['335654', '335655', '335658', '335659']
nosy_count = 4.0
nosy_names = ['docs@python', 'Anthony Sottile', 'Mariatta', 'miss-islington']
pr_nums = ['11887']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue36007'
versions = ['Python 3.8']