Merge pull request #32322 from EricPonvelle/BZ1822903-NSGPortFixes

BZ1822903: Updated the Network Security Groups requirements table

Author: kalexand-rh

modules/installation-about-custom-azure-vnet.adoc

@@ -79,26 +79,29 @@ The network security group rules must be in place before you install the cluster
 
 |`80`
 |Allows HTTP traffic
-|x
 |
+|x
 
 |`443`
 |Allows HTTPS traffic
-|x
 |
+|x
 
 |`6443`
 |Allows communication to the control plane machines
 |x
-|x
+|
 
 |`22623`
 |Allows communication to the machine config server
 |x
-|x
-
+|
 |===
 
+[NOTE]
+====
+Since cluster components do not modify the user-provided network security groups, which the Kubernetes controllers update, a pseudo-network security group is created for the Kubernetes controller to modify without impacting the rest of the environment.
+====
 
 [id="installation-about-custom-azure-permissions_{context}"]
 == Division of permissions