"expression" is erroneous in the doc

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-10-28.14:51:26.855>
labels = ['3.11', '3.9', '3.10', 'docs']
title = '"expression" is erroneous in the doc'
updated_at = <Date 2021-11-02.16:23:39.061>
user = 'https://github.com/Arthur-Milchior'

bugs.python.org fields:

activity = <Date 2021-11-02.16:23:39.061>
actor = 'terry.reedy'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2021-10-28.14:51:26.855>
creator = 'Arthur-Milchior'
dependencies = []
files = []
hgrepos = []
issue_num = 45647
keywords = []
message_count = 1.0
messages = ['405189']
nosy_count = 2.0
nosy_names = ['docs@python', 'Arthur-Milchior']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue45647'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']