doc:add --cpu host in virt-install cli

Signed-off-by: Sayan Paul <[email protected]>

README.md

@@ -95,6 +95,7 @@ qemu-system-x86_64 \
 ```bash
 sudo virt-install \
     --name fedora-bootc \
+    --cpu host \
     --vcpus 4 \
     --memory 4096 \
     --import --disk ./output/qcow2/disk.qcow2,format=qcow2 \