Update CPU hotplug note to state VM restart is optional

Author: Vaishali-gif-rh

modules/virt-hot-plugging-cpu.adoc

@@ -19,3 +19,12 @@ You can increase or decrease the number of CPU sockets allocated to a virtual ma
 +
 If the VM is migratable, a live migration is triggered. If not, or if the changes cannot be live-updated, a `RestartRequired` condition is added to the VM.
 
+[NOTE]
+====
+If a VM has `spec.template.spec.domain.devices.networkInterfaceMultiQueue` enabled and CPUs are hot-plugged:
+
+
+* Existing network interfaces that were attached before the CPU hot plug retain their original queue count, even after additional virtual CPUs (vCPUs) are added. This behavior is expected due to the underlying virtualization technology.
+* To update the queue count of existing interfaces to match the new vCPU configuration, you can optionally restart the VM. A restart is not required unless this update is needed for performance reasons.
+* Any new virtio network interfaces that are hot-plugged after the CPU hot plug automatically have their queue count configured to match the updated vCPU configuration.
+====