Document the ABCs for instance/subclass checks of dict view types

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-07-18.01:25:15.883>
labels = ['3.11', 'type-feature', 'docs']
title = 'Document the ABCs for instance/subclass checks of dict view types'
updated_at = <Date 2021-10-21.23:51:52.797>
user = 'https://github.com/story645'

bugs.python.org fields:

activity = <Date 2021-10-21.23:51:52.797>
actor = 'iritkatriel'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2016-07-18.01:25:15.883>
creator = 'story645'
dependencies = []
files = ['43768']
hgrepos = []
issue_num = 27544
keywords = ['patch']
message_count = 3.0
messages = ['270672', '270674', '271029']
nosy_count = 5.0
nosy_names = ['terry.reedy', 'docs@python', 'abarry', 'story645', 'Jeffrey McLarty']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue27544'
versions = ['Python 3.11']