BZ2229164: Minor update to bridge NAD YAML

Author: Shikha Jhala

modules/virt-creating-linux-bridge-nad-cli.adoc

@@ -38,7 +38,8 @@ spec:
     "type": cnv-bridge, <4>
     "bridge": bridge-interface, <5>
     "macspoofchk": true, <6>
-    "vlan": 1 <7>
+    "vlan": 100, <7>
+    "preserveDefaultVlan": false <8>
   }'
 ----
 <1> The name for the `NetworkAttachmentDefinition` object.
@@ -48,6 +49,7 @@ spec:
 <5> The name of the Linux bridge configured on the node.
 <6> Optional: Flag to enable MAC spoof check. When set to `true`, you cannot change the MAC address of the pod or guest interface. This attribute provides security against a MAC spoofing attack by allowing only a single MAC address to exit the pod.
 <7> Optional: The VLAN tag. No additional VLAN configuration is required on the node network configuration policy.
+<8> Optional: Indicates whether the VM connects to the bridge through the default VLAN. The default value is `true`.
 +
 [NOTE]
 ====