README.md: Update libvirt examples

The first one didn't work because the default Fedora image requires
specifying a filesystem. See
https://gitlab.com/fedora/bootc/docs/-/merge_requests/141
for improved docs on that.

Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

README.md

@@ -50,16 +50,19 @@ The libvirt commands provide comprehensive integration with libvirt infrastructu
 
 ```bash
 # Basic libvirt VM creation with default settings (2GB RAM, 2 CPUs, 20GB disk)
-bcvk libvirt run quay.io/fedora/fedora-bootc:42
+bcvk libvirt run quay.io/centos-bootc/centos-bootc:stream10
+
+# Note requirement for --filesystem with the generic Fedora bootc base images
+bcvk libvirt run --filesystem btrfs quay.io/fedora/fedora-bootc:43
 
 # Custom VM with specific resources and name
-bcvk libvirt run --name my-fedora-vm --memory 4096 --cpus 4 --disk-size 50G quay.io/fedora/fedora-bootc:42
+bcvk libvirt run --name example-vm --memory 4096 --cpus 4 --disk-size 50G quay.io/centos-bootc/centos-bootc:stream10
 
-# Run VM with port forwarding and volume mounts
-bcvk libvirt run --name web-server --port 8080:80 --volume /host/data:/mnt/data quay.io/centos-bootc/centos-bootc:stream10
+# This example forwards a port and bind mounts content from the host
+bcvk libvirt run --name web-server --port 8080:80 --volume /host/data:/mnt/data localhost/myimage
 
-# Run VM in background and automatically SSH into it
-bcvk libvirt run --detach --ssh --name test-vm quay.io/fedora/fedora-bootc:42
+# Bind mount the host container storage for faster updates
+bcvk libvirt run --update-from-host --name devvm localhost/myimage
 ```
 
 #### Managing libvirt VMs