[syslinux] Fedora 37 release notes

[solarflow99]

FYI,

*In previous Fedora releases, the minimal installer image (boot.iso) used
the syslinux bootloader when booting on systems using BIOS firmware, while
on UEFI systems GRUB2 is used. However, the syslinux project is no longer
being developed upstream. Therefore, starting with Fedora 37, boot.iso
images will use GRUB2 on both BIOS and UEFI-based systems.*