initrd/.ash_history: Add comments after reboot/poweroff

Add comments after reboot/poweroff to clarify what they do.  These
commands are here partly for discoverability by users who might not
know what to do in a recovery shell, so clarifying their purpose helps
those users figure out what to do.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>

Author: JonathonHall-Purism

initrd/.ash_history

@@ -16,5 +16,5 @@ seal-totp
 cbmem --console | grep '^ME'
 cbmem --console | less
 # Reboot/power off (important for devices with no keyboard to escape recovery shell)
-reboot
-poweroff
+reboot  # Press Enter with this command to reboot
+poweroff  # Press Enter with this command to power off