Update Python 3 extension module porting guide

BPO	23897
Nosy	@warsaw, @doko42, @ncoghlan, @encukou, @kushaldas, @brainwane
PRs	bpo-24937: Replace the extension module porting HOWTO by links to external projects #9317

^{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 = 'https://github.com/warsaw'
closed_at = None
created_at = <Date 2015-04-09.14:15:35.569>
labels = ['type-feature', 'docs']
title = 'Update Python 3 extension module porting guide'
updated_at = <Date 2020-05-28.08:56:10.449>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2020-05-28.08:56:10.449>
actor = 'petr.viktorin'
assignee = 'barry'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2015-04-09.14:15:35.569>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 23897
keywords = ['patch']
message_count = 3.0
messages = ['240328', '370155', '370179']
nosy_count = 7.0
nosy_names = ['barry', 'doko', 'ncoghlan', 'petr.viktorin', 'bkabrda', 'kushal.das', 'sumanah']
pr_nums = ['9317']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue23897'
versions = ['Python 3.5', 'Python 3.6']