grub-probe --target=disk not documented

[Phillip Susi]

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I noticed that --target=disk is not mentioned in either the grub-probe
man page, nor --help.

Also I noticed that it gives no output, or error for lvm disks:

grub-probe --target=disk /
#no output or error
grub-probe --target=device /
/dev/mapper/devserv-root
grub-probe --target=disk -d /dev/mapper/devserv-root
#no output or error
grub-probe --target=disk -d /dev/mapper/md0
/dev/md0

Why does it appear to give the same output as --target=device when run
on md or sd devices, then nothing for lvm?

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