Updates eSwitch mode in SRIOV docs

Author: Steven Smith

modules/nw-sriov-networknodepolicy-object.adoc

@@ -34,7 +34,7 @@ spec:
   deviceType: <device_type> <15>
   isRdma: false <16>
   linkType: <link_type> <17>
-  eSwitchMode: "switchdev" <18>
+  eSwitchMode: <mode> <18>
   excludeTopology: false <19>
 ----
 <1> The name for the custom resource object.
@@ -97,7 +97,11 @@ When `linkType` is set to `ib`, `isRdma` is automatically set to `true` by the S
 +
 Do not set linkType to 'eth' for SriovNetworkNodePolicy, because this can lead to an incorrect number of available devices reported by the device plugin.
 
-<18> Optional: To enable hardware offloading, the 'eSwitchMode' field must be set to `"switchdev"`.
+<18> Optional: The NIC device mode. The only allowed values are `legacy` or `switchdev`.
++
+When `eSwitchMode` is set to `legacy`, the default SR-IOV behavior is enabled.
++
+When `eSwitchMode` is set to `switchdev`, hardware offloading is enabled. 
 
 <19> Optional: To exclude advertising an SR-IOV network resource's NUMA node to the Topology Manager, set the value to `true`. The default value is `false`.