Event Gateway | Update Virtual Cluster Developer Docs

[shivaygupta-dotcom]

We need to update the terraform configuration on virtual cluster developer docs.

1. Currently we are setting up name on destination field, like below. We need to update this name field to id.

   destination = {
   name = "example-backend-cluster"
   }

   Required Format:
   destination = {
   id = "konnect_event_gateway_backend_cluster.my_backend_cluster.id"
   }

Ref: [https://developer.konghq.com/event-gateway/entities/virtual-cluster/]