Doc sys.prefix lib & include directories on Windows and Mac

[CatherineH]

BPO	45788
Nosy	@terryjreedy, @vstinner, @ned-deily, @zooba, @miss-islington, @CatherineH
PRs	bpo-45788: Link sys.prefix doc to 'Installation paths' #29606 [3.10] bpo-45788: Link sys.prefix doc to 'Installation paths' (GH-29606) #29631 [3.9] bpo-45788: Link sys.prefix doc to 'Installation paths' (GH-29606) #29632

^{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 2021-11-18.21:46:42.428>
created_at = <Date 2021-11-11.18:16:42.063>
labels = ['3.11', 'type-bug', '3.9', '3.10', 'docs']
title = 'Doc sys.prefix lib & include directories on Windows and Mac'
updated_at = <Date 2021-11-18.21:46:42.427>
user = 'https://github.com/CatherineH'

bugs.python.org fields:

activity = <Date 2021-11-18.21:46:42.427>
actor = 'terry.reedy'
assignee = 'docs@python'
closed = True
closed_date = <Date 2021-11-18.21:46:42.428>
closer = 'terry.reedy'
components = ['Documentation']
creation = <Date 2021-11-11.18:16:42.063>
creator = 'CatherineH'
dependencies = []
files = []
hgrepos = []
issue_num = 45788
keywords = ['patch']
message_count = 10.0
messages = ['406168', '406249', '406253', '406255', '406261', '406264', '406265', '406562', '406564', '406565']
nosy_count = 7.0
nosy_names = ['terry.reedy', 'vstinner', 'ned.deily', 'docs@python', 'steve.dower', 'miss-islington', 'CatherineH']
pr_nums = ['29606', '29631', '29632']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45788'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[CatherineH]

On the page:

https://docs.python.org/3.10/library/sys.html#sys.prefix

the text says

The main collection of Python library modules is installed in the directory prefix/lib/pythonX.Y while the platform independent header files (all except pyconfig.h) are stored in prefix/include/pythonX.Y, where X.Y is the version number of Python, for example 3.2.

However, this seems to only be true on *nix systems. On Windows, the lib and header files are just in prefix/lib and prefix/include. Maybe the text should be changed to say:

On linux, the main collection of Python library modules is installed in the directory prefix/lib/pythonX.Y while the platform independent header files (all except pyconfig.h) are stored in prefix/include/pythonX.Y, where X.Y is the version number of Python, for example 3.2. On Winodws, there are in prefix/lib and prefix/includes.