Update gcp-private-service-connect.adoc - Add more steps for BYOC (#220)

* Update gcp-private-service-connect.adoc

* Update modules/networking/pages/gcp-private-service-connect.adoc

Co-authored-by: Michele Cyran <[email protected]>

* Update modules/networking/pages/gcp-private-service-connect.adoc

Co-authored-by: Michele Cyran <[email protected]>

* Update modules/networking/pages/gcp-private-service-connect.adoc

Co-authored-by: Michele Cyran <[email protected]>

* fix formatting

---------

Co-authored-by: Michele Cyran <[email protected]>

Author: david-yu

modules/networking/pages/gcp-private-service-connect.adoc

@@ -208,11 +208,18 @@ CAUTION: As soon as Private Service Connect is available on your VPC, all commun
 export CLUSTER_ID=<cluster-id>
 ----
 
-. For a *BYOC cluster*, run `rpk cloud byoc gcp apply`:
-+
+. For a *BYOC cluster*:
++ 
+--
+- Run `rpk cloud byoc gcp apply` to ensure that the PSC subnets are created in your BYOC cluster. 
 ```bash
-rpk cloud byoc gcp apply --redpanda-id='$CLUSTER_ID' --project-id='<service-project-id>'
+rpk cloud byoc gcp apply --redpanda-id="${CLUSTER_ID}" --project-id='<service-project-id>'
 ``` 
+- Run `gcloud compute networks subnets list` to find the newly-created Private Service Connect NAT subnet name. 
+```bash
+gcloud compute networks subnets list --filter psc2-nat --format="value(name)"
+```
+--
 +
 For a *BYOVPC cluster*:
 +
@@ -222,21 +229,20 @@ For a *BYOVPC cluster*:
 - Run `rpk cloud byoc gcp apply`:
 +
 ```bash
-rpk cloud byoc gcp apply --redpanda-id='$CLUSTER_ID' --project-id='<service-project-id>'
+rpk cloud byoc gcp apply --redpanda-id="${CLUSTER_ID}" --project-id='<service-project-id>'
 ``` 
 --
 
 . Make a request to the xref:api:ROOT:cloud-controlplane-api.adoc#patch-/v1/clusters/-cluster.id-[`PATCH /v1/clusters/{cluster.id}`] endpoint to update the cluster to include the newly-created Private Service Connect NAT subnet.
 +
 [,bash]
 ----
-export ACCEPT_LIST='[]'
 export PSC_NAT_SUBNET_NAME='<psc-nat-subnet-name>'
 export CLUSTER_PATCH_BODY=`cat << EOF
 {
     "customer_managed_resources": {
         "gcp": {
-            "psc_nat_subnet_name": "$PSC_NAT_SUBNET_NAME"
+            "psc_nat_subnet_name": "${PSC_NAT_SUBNET_NAME}"
         }
     }
 }