docs(zfs): Export zpool when done working on it (#3)

README.md

@@ -409,7 +409,7 @@ zfs create zpool/data/var/lib/docker
 In case you want to mount your zpool on an external operating system such as an Arch Linux live CD ISO image do it like so:
 
 ```
-zpool import zpool -d '/dev/disk/by-partuuid' -R '/mnt' -f -N
+zpool import 'zpool' -d '/dev/disk/by-partuuid' -R '/mnt' -f -N
 zfs load-key -L 'prompt' 'zpool'
 zfs mount 'zpool/root/archlinux'
 zfs mount -a
@@ -417,6 +417,14 @@ mount '/dev/sda1' '/mnt/efi'
 arch-chroot '/mnt' '/bin/bash'
 ```
 
+When done cleanly remove your work:
+
+```
+umount '/mnt/efi'
+zfs umount -a
+zpool export 'zpool'
+```
+
 Explanation:
 
 - We always want to mount pools `by-partuuid` for consistency so we specifically only look for pools at `/dev/disk/by-partuuid`.