OCPBUGS-38261 SR-IOV drain reboot causes need to be explained

Author: kquinn1204

modules/nw-sriov-configuring-device.adoc

@@ -25,8 +25,12 @@ You can configure an SR-IOV network device by creating a SriovNetworkNodePolicy
 [NOTE]
 =====
 When applying the configuration specified in a `SriovNetworkNodePolicy` object, the SR-IOV Operator might drain the nodes, and in some cases, reboot nodes.
+Reboot only happens in the following cases:
 
-It might take several minutes for a configuration change to apply.
+* With Mellanox NICs (`mlx5` driver) a node reboot happens every time the number of virtual functions (VFs) increase on a physical function (PF). 
+* With Intel NICs, a reboot only happens if the kernel parameters do not include `intel_iommu=on` and `iommu=pt`.
+
+It might take several minutes for a configuration change to apply. 
 =====
 
 .Prerequisites