Update master/worker subnet CIDR examples

Author: codyhoag

modules/installation-creating-gcp-vpc.adoc

@@ -105,8 +105,8 @@ ifdef::shared-vpc[]
 <1> `infra_id` is the prefix of the network name.
 endif::shared-vpc[]
 <2> `region` is the region to deploy the cluster into, for example `us-central1`.
-<3> `master_subnet_cidr` is the CIDR for the master subnet, for example `10.0.0.0/19`.
-<4> `worker_subnet_cidr` is the CIDR for the worker subnet, for example `10.0.32.0/19`.
+<3> `master_subnet_cidr` is the CIDR for the master subnet, for example `10.0.0.0/17`.
+<4> `worker_subnet_cidr` is the CIDR for the worker subnet, for example `10.0.128.0/17`.
 
 . Create the deployment by using the `gcloud` CLI:
 +