Cmd.onecmd documentation is misleading

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2017-12-12.00:20:54.862>
labels = ['3.7', 'library']
title = 'Cmd.onecmd documentation is misleading'
updated_at = <Date 2017-12-12.00:20:54.862>
user = 'https://bugs.python.org/lyda'

bugs.python.org fields:

activity = <Date 2017-12-12.00:20:54.862>
actor = 'lyda'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2017-12-12.00:20:54.862>
creator = 'lyda'
dependencies = []
files = []
hgrepos = []
issue_num = 32283
keywords = []
message_count = 1.0
messages = ['308082']
nosy_count = 1.0
nosy_names = ['lyda']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue32283'
versions = ['Python 3.6', 'Python 3.7']