Document that dataclasses.FrozenInstanceError derives from AttributeError

[ericvsmith]

BPO	43938
Nosy	@ericvsmith, @miss-islington, @Llandy3d
PRs	bpo-43938: improve dataclasses.FrozenInstanceError documentation #25603 [3.9] bpo-43938: improve dataclasses.FrozenInstanceError documentation (GH-25603) #25635 [3.8] bpo-43938: improve dataclasses.FrozenInstanceError documentation (GH-25603) #25636

^{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 2021-04-26.19:37:02.370>
created_at = <Date 2021-04-25.16:25:34.649>
labels = ['easy', '3.8', '3.9', '3.10', 'docs']
title = 'Document that dataclasses.FrozenInstanceError derives from AttributeError'
updated_at = <Date 2021-04-26.19:37:02.369>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2021-04-26.19:37:02.369>
actor = 'eric.smith'
assignee = 'docs@python'
closed = True
closed_date = <Date 2021-04-26.19:37:02.370>
closer = 'eric.smith'
components = ['Documentation']
creation = <Date 2021-04-25.16:25:34.649>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 43938
keywords = ['patch', 'easy', 'newcomer friendly']
message_count = 6.0
messages = ['391861', '391956', '391966', '391974', '391975', '391976']
nosy_count = 4.0
nosy_names = ['eric.smith', 'docs@python', 'miss-islington', 'llandy3d']
pr_nums = ['25603', '25635', '25636']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43938'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[ericvsmith]

This is a newcomer friendly issue. The documentation just needs a sentence that FrozenInstanceError is derived from AttributeError.