Update nova04delta docs

Signed-off-by: Bohdan Dobrelia <[email protected]>

Author: bogdando

examples/dt/nova/nova04delta/README.md

@@ -29,11 +29,10 @@ The following parameters are crucial for host-level configuration:
 
 ## Nova Configuration
 
-# FIXME: this looks only used in PCI groups in placement? The same pci_passthrough:alias should be used in both cases it seems?
-Nova control plane is configured for requesting PCI devices from Placement
-through `resources:VGPU=X` flavor extra specs.
-That is a contrary to the legacy mode where PCI devices used to be requested through
-`pci_passthrough:alias` flavor extra specs.
+A count of `X` PCI devices may be requested through `"pci_passthrough:alias"="nvidia_a2:X"` flavor extra specs:
+```
+$ openstack --os-compute-api=2.86 flavor set --property "pci_passthrough:alias"="nvidia_a2:1" device_passthrough
+```
 
 ### Control Plane (`examples/dt/nova/nova04delta/service-values.yaml`)