[doc] creating large SharedMemory crashes on MacOs

[bf8b85a2-9df0-412b-b6c3-5481df7521c8]

BPO	39584
Nosy	@ronaldoussoren, @pitrou, @tiran, @ned-deily, @applio, @vinay0410
PRs	python/cpython#21877

^{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 = None
created_at = <Date 2020-02-08.14:18:24.896>
labels = ['OS-mac', '3.8', '3.9', 'expert-C-API', 'type-crash', 'docs']
title = 'multiprocessing.shared_memory: MacOS crashes by running attached Python code'
updated_at = <Date 2020-11-17.10:55:29.496>
user = 'https://github.com/vinay0410'

bugs.python.org fields:

activity = <Date 2020-11-17.10:55:29.496>
actor = 'ronaldoussoren'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation', 'macOS', 'C API']
creation = <Date 2020-02-08.14:18:24.896>
creator = 'vinay0410'
dependencies = []
files = []
hgrepos = []
issue_num = 39584
keywords = ['patch']
message_count = 9.0
messages = ['361629', '361924', '373806', '375229', '375245', '375249', '381221', '381222', '381223']
nosy_count = 7.0
nosy_names = ['ronaldoussoren', 'pitrou', 'christian.heimes', 'ned.deily', 'docs@python', 'davin', 'vinay0410']
pr_nums = ['21877']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue39584'
versions = ['Python 3.8', 'Python 3.9']