Fix platform-compatibility-tags.rst macOS arch table typo.

[jsirois]

Someone is wrong, and I expect packaging is de-facto right since its code well used in the wild: https://github.com/pypa/packaging/blob/a9f77f8269d6897a3dbf28f2c0129a354478d5de/src/packaging/tags.py#L543-L548

If packaging is actually wrong here, I can go over there and submit a PR.

[jsirois]

The linkcheck failure is for https://flatpak.org/ (unrelated to this PR) and I find:

:; curl -vf https://flatpak.org/
* Host flatpak.org:443 was resolved.
* IPv6: 2a04:4e42:82::347
* IPv4: 146.75.73.91
*   Trying [2a04:4e42:82::347]:443...
*   Trying 146.75.73.91:443...
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* SSL Trust Anchors:
*   CAfile: /etc/ssl/certs/ca-certificates.crt
*   CApath: /etc/ssl/certs
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256 / X25519MLKEM768 / RSASSA-PSS
* ALPN: server accepted h2
* Server certificate:
*   subject: CN=n.sni-347-default.ssl.fastly.net
*   start date: Sep 17 05:11:14 2025 GMT
*   expire date: Oct 19 05:11:13 2026 GMT
*   issuer: C=BE; O=GlobalSign nv-sa; CN=GlobalSign Atlas R3 DV TLS CA 2025 Q3
*   Certificate level 0: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 1: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*   Certificate level 2: Public key type RSA (2048/112 Bits/secBits), signed using sha256WithRSAEncryption
*  subjectAltName does not match hostname flatpak.org
* SSL: no alternative certificate subject name matches target hostname 'flatpak.org'
* closing connection #0
curl: (60) SSL: no alternative certificate subject name matches target hostname 'flatpak.org'
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the webpage mentioned above.

Apparently #2035 doesn't work / cover all PR scenarios?

[ned-deily]

fat3 is correct. See https://github.com/python/cpython/blob/main/Lib/_osx_support.py#L556. This dates back to macOS 10.6 days when the operating system supported those three architectures in the system binaries. Also fat32 would be inappropriate since x86_64 is a 64-bit architecture.

[jsirois]

Thanks @ned-deily; so packaging has this wrong then! Since the OS is so old, and unlike Linux and Windows Mac makes owning / operating these old OSes nigh impossible; I suspect its a bug no one has ever hit. I'll close this and send those folks a PR instead.

[ned-deily]

Yeah, it's very old. We'll probably remove support for those ancient universal build combinations from CPython sometime soon.

[jsirois]

Fix up in pypa/packaging#1199