Fix section title out of sequence warning

Author: jboxman

networking/configuring_ingress_cluster_traffic/configuring-externalip.adoc

@@ -13,11 +13,11 @@ This functionality is generally most useful for clusters installed on bare-metal
 
 * Your network infrastructure must route traffic for the external IP addresses to your cluster.
 
-include::modules/nw-externalip-about.adoc[leveloffset=1]
+include::modules/nw-externalip-about.adoc[leveloffset=+1]
 
-include::modules/nw-externalip-object.adoc[leveloffset=1]
+include::modules/nw-externalip-object.adoc[leveloffset=+1]
 
-include::modules/nw-externalip-configuring.adoc[leveloffset=1]
+include::modules/nw-externalip-configuring.adoc[leveloffset=+1]
 
 [id="configuring-externalip-next-steps"]
 == Next steps