remove ip-address-type dualstack annotation from 2048 example (#2331)

Author: kishorj

docs/examples/2048/2048_full_latest.yaml

@@ -49,7 +49,6 @@ metadata:
     kubernetes.io/ingress.class: alb
     alb.ingress.kubernetes.io/scheme: internet-facing
     alb.ingress.kubernetes.io/target-type: ip
-    alb.ingress.kubernetes.io/ip-address-type: dualstack
 spec:
   rules:
     - http: