update fcos documentation

docs/operating_systems/fcos.md

@@ -1,6 +1,6 @@
 # Fedora CoreOS
 
-Tested with stable version 37.20230322.3.0
+Tested with stable version 40.20241019.3.0
 
 Because package installation with `rpm-ostree` requires a reboot, playbook may fail while bootstrap.
 Restart playbook again.
@@ -30,7 +30,7 @@ files:
 
 ### Prepare
 
-Prepare ignition and serve via http (a.e. python -m http.server )
+Create ignition file
 
 ```json
 {
@@ -51,19 +51,8 @@ Prepare ignition and serve via http (a.e. python -m http.server )
   }
 }
 ```
+and [produce an Ignition Config](https://docs.fedoraproject.org/en-US/fedora-coreos/producing-ign/)
 
 ### create guest
 
-```ShellSeasion
-machine_name=myfcos1
-ignition_url=http://mywebserver/fcos.ign
-
-fcos_version=34.20210611.3.0
-kernel=https://builds.coreos.fedoraproject.org/prod/streams/stable/builds/${fcos_version}/x86_64/fedora-coreos-${fcos_version}-live-kernel-x86_64
-initrd=https://builds.coreos.fedoraproject.org/prod/streams/stable/builds/${fcos_version}/x86_64/fedora-coreos-${fcos_version}-live-initramfs.x86_64.img
-rootfs=https://builds.coreos.fedoraproject.org/prod/streams/stable/builds/${fcos_version}/x86_64/fedora-coreos-${fcos_version}-live-rootfs.x86_64.img
-kernel_args="console=ttyS0 coreos.live.rootfs_url=${rootfs} coreos.inst.install_dev=/dev/sda coreos.inst.stream=stable coreos.inst.ignition_url=${ignition_url}"
-sudo virt-install --name ${machine_name} --ram 4048 --graphics=none --vcpus 2 --disk size=20 \
-                --network bridge=virbr0 \
-                --install kernel=${kernel},initrd=${initrd},kernel_args_overwrite=yes,kernel_args="${kernel_args}"
-```
+see [Provisioning Fedora CoreOS on libvirt](https://docs.fedoraproject.org/en-US/fedora-coreos/provisioning-libvirt/)