criterion change proposal: macOS dual-boot

[Kamil Paral]

Our current macOS (still called OS X) dual boot criterion says:

"The installer must be able to install into free space alongside an
existing OS X installation, install and configure a bootloader that will
boot Fedora."
https://fedoraproject.org/wiki/Fedora_38_Final_Release_Criteria#OS_X_dual...

I suggest renaming  "OS X" to "macOS" in the section title and in the
criterion text. That reflects the name change that Apple did in the past.

I also suggest adding this footnote:
"Footnote: Supported hardware
This criterion only covers Mac devices with an Intel x86_64 processor."

That makes it explicit that we don't support the latest ARM-based M<number>
custom processors, nor the older PowerPC-based devices. I originally wanted
to link to some official Fedora requirements, but we don't seem to have any
(for Macs), so at least a footnote here.

Thoughts?