The PDF for Lab/Exercise 28.3 is misformatted and can't be read properly. Looks like it was accidentally converted from landscape to portrait.
Actually it's possible the line just failed to wrap.
There are archives for this forum and this has already been thoroughly discussed: https://forum.linuxfoundation.org/discussion/856304/where-is-the-rest-of-lab-28-3-virtual-machine-from-cli#latest
It has been fixed in the working version of the next update (we cannot update the course for a typo or two because the whole course needs updating at once). It should have been on two lines:
$ sudo qemu-img create -f qcow2 /var/lib/libvirtd/myimg.qcow2 24M
$ sudo qemu-system-x86_64 -hda /var/lib/libvirtd/myimg.qcow2 \
-cdrom /teaching/LFCW/RESOURCES/LFS301/CorePlus-current.iso -usbdevice tablet