Clarify that tp_dealloc must decref for heap allocated type

ammaraskar

BPO	38206
Nosy	@ammaraskar, @miss-islington
PRs	bpo-38206: Clarify tp_dealloc requirements for heap allocated types. #16248 [3.8] bpo-38206: Clarify tp_dealloc requirements for heap allocated types. (GH-16248) #16436

^{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 2019-09-27.16:49:33.332>
created_at = <Date 2019-09-17.23:27:39.940>
labels = ['type-feature', '3.9', 'docs']
title = 'Clarify that tp_dealloc must decref for heap allocated type'
updated_at = <Date 2019-09-27.16:49:33.332>
user = 'https://github.com/ammaraskar'

bugs.python.org fields:

activity = <Date 2019-09-27.16:49:33.332>
actor = 'ammar2'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-09-27.16:49:33.332>
closer = 'ammar2'
components = ['Documentation']
creation = <Date 2019-09-17.23:27:39.940>
creator = 'ammar2'
dependencies = []
files = []
hgrepos = []
issue_num = 38206
keywords = ['patch']
message_count = 3.0
messages = ['352672', '353354', '353355']
nosy_count = 3.0
nosy_names = ['docs@python', 'ammar2', 'miss-islington']
pr_nums = ['16248', '16436']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue38206'
versions = ['Python 3.9']