Document multiprocessing.set_forkserver_preload

[maggyero]

BPO	46851
Nosy	@maggyero

^{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 2022-02-24.19:12:34.414>
labels = ['type-feature', '3.9', '3.10', '3.11']
title = 'Document multiprocessing.set_forkserver_preload'
updated_at = <Date 2022-02-24.23:44:54.309>
user = 'https://github.com/maggyero'

bugs.python.org fields:

activity = <Date 2022-02-24.23:44:54.309>
actor = 'AlexWaygood'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2022-02-24.19:12:34.414>
creator = 'maggyero'
dependencies = []
files = []
hgrepos = []
issue_num = 46851
keywords = []
message_count = 2.0
messages = ['413934', '413942']
nosy_count = 2.0
nosy_names = ['docs@python', 'maggyero']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue46851'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[maggyero]

I have just notice that the multiprocessing.set_forkserver_preload (which originates from multiprocessing.forkserver.set_forkserver_preload) is not documented:
https://github.com/python/cpython/blob/v3.10.2/Lib/multiprocessing/context.py#L180-L185

[AlexWaygood]

(3.7 and 3.8 are not accepting patches unless they relate to security issues, so I am removing them from the "versions" field.)