doc: update code to "losetup -r"
@@ -126,7 +126,7 @@ Start the User OS (UOS)
.. code-block:: none
- # losetup -f -P --show ~/uos.img
+ # losetup -r -f -P --show ~/uos.img
# mount /dev/loop0p3 /mnt
# ls -l /mnt/usr/lib/kernel/
