This commit fixes two instances of a miscount. As the number is not important in either case, and seemingly subject to changes, it was removed entirely.
Another sentence was reworded to improve readability.
The specified vendor UUID is not actually a UUID. This changes it to an actual UUID.
The new value matches the ones from the systemd-boot man page and [The Boot Loader Interface](https://systemd.io/BOOT_LOADER_INTERFACE/).