Move and clarify Py_Main documentation

ncoghlan

BPO	34206
Nosy	@ncoghlan, @ericsnowcurrently, @emilyemorehouse
PRs	bpo-34206: Improve docs and test coverage for pre-init functions #8023
Dependencies	bpo-34008: Do we support calling Py_Main() after Py_Initialize()?

^{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/ncoghlan'
closed_at = None
created_at = <Date 2018-07-24.13:37:49.167>
labels = ['type-feature', '3.8', '3.9', '3.10', 'docs']
title = 'Move and clarify Py_Main documentation'
updated_at = <Date 2020-06-29.10:35:59.565>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2020-06-29.10:35:59.565>
actor = 'vstinner'
assignee = 'ncoghlan'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2018-07-24.13:37:49.167>
creator = 'ncoghlan'
dependencies = ['34008']
files = []
hgrepos = []
issue_num = 34206
keywords = ['patch']
message_count = 3.0
messages = ['322301', '372503', '372504']
nosy_count = 3.0
nosy_names = ['ncoghlan', 'eric.snow', 'emilyemorehouse']
pr_nums = ['8023']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue34206'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']