Documented interaction of single-stage init and sub-interpreters inaccurate

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-11-09.17:51:42.034>
labels = ['3.7', '3.8', '3.9', '3.10', 'docs']
title = 'Documented interaction of single-stage init and sub-interpreters inaccurate'
updated_at = <Date 2020-11-09.17:51:42.034>
user = 'https://github.com/yol'

bugs.python.org fields:

activity = <Date 2020-11-09.17:51:42.034>
actor = 'pkerling'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2020-11-09.17:51:42.034>
creator = 'pkerling'
dependencies = []
files = []
hgrepos = []
issue_num = 42298
keywords = []
message_count = 1.0
messages = ['380602']
nosy_count = 2.0
nosy_names = ['docs@python', 'pkerling']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue42298'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']