Multi-processing example inaccurate warning

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-10-04.10:40:06.011>
labels = ['3.8', 'docs']
title = 'Multi-processing example inaccurate warning'
updated_at = <Date 2018-10-06.09:05:47.474>
user = 'https://github.com/TonyFlury'

bugs.python.org fields:

activity = <Date 2018-10-06.09:05:47.474>
actor = 'anthony-flury'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2018-10-04.10:40:06.011>
creator = 'anthony-flury'
dependencies = []
files = []
hgrepos = []
issue_num = 34891
keywords = []
message_count = 3.0
messages = ['327046', '327049', '327238']
nosy_count = 3.0
nosy_names = ['docs@python', 'anthony-flury', 'xtreak']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue34891'
versions = ['Python 3.8']