Removed a redundant URL from the allowlist.

Author: EricPonvelle

modules/configuring-firewall.adoc

@@ -123,16 +123,12 @@ CDN host names, such as `cdn01.quay.io`, are covered when you add a wildcard ent
 
 |`api.openshift.com`
 |443, 80
-|Required to check if updates are available for the cluster.
+|Required both for your cluster token and to check if updates are available for the cluster.
 
 |`art-rhcos-ci.s3.amazonaws.com`
 |443, 80
 |Required to download {op-system-first} images.
 
-|`api.openshift.com`
-|443, 80
-|Required for your cluster token.
-
 |`cloud.redhat.com/openshift`
 |443, 80
 |Required for your cluster token.