Document Argument Clinic's defining_class converter

[erlend-aasland]

BPO	42048
Nosy	@vstinner, @larryhastings, @erlend-aasland
PRs	bpo-42048: Document AC's defining_class converter #23978

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-01-20.11:21:40.036>
created_at = <Date 2020-10-15.20:12:24.940>
labels = ['type-feature', 'expert-argument-clinic', '3.10', '3.9']
title = "Document Argument Clinic's defining_class converter"
updated_at = <Date 2021-01-20.11:21:40.036>
user = 'https://github.com/erlend-aasland'

bugs.python.org fields:

activity = <Date 2021-01-20.11:21:40.036>
actor = 'erlendaasland'
assignee = 'none'
closed = True
closed_date = <Date 2021-01-20.11:21:40.036>
closer = 'erlendaasland'
components = ['Argument Clinic']
creation = <Date 2020-10-15.20:12:24.940>
creator = 'erlendaasland'
dependencies = []
files = []
hgrepos = []
issue_num = 42048
keywords = ['patch']
message_count = 2.0
messages = ['378696', '385334']
nosy_count = 3.0
nosy_names = ['vstinner', 'larry', 'erlendaasland']
pr_nums = ['23978']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42048'
versions = ['Python 3.9', 'Python 3.10']

[erlend-aasland]

The 'defining_class' AC converter is not documented.

https://www.python.org/dev/peps/pep-0573/#argument-clinic
https://docs.python.org/3.10/howto/clinic.html

[vstinner]

New changeset e982fe4 by Erlend Egeberg Aasland in branch 'master':
bpo-42048: Clinic Howto: Document AC's defining_class converter (GH-23978)
e982fe4