OCPBUGS#9090: A service principal validity can be extended

Author: xenolinux

modules/installation-azure-service-principal.adoc

@@ -173,9 +173,11 @@ endif::[]
 ----
 $ az ad sp create-for-rbac --role Contributor --name <service_principal> \ <1>
   --scopes /subscriptions/<subscription_id> <2>
+  --years <years> <3>
 ----
 <1> Specify the service principal name.
 <2> Specify the subscription ID.
+<3> Specify the number of years. By default, a service principal expires in one year. By using the `--years` option you can extend the validity of your service principal.
 +
 .Example output
 [source,terminal]