message: point devs to wrangler.toml when adding preview id
diff: @@ -439,7 +439,7 @@ fn get_namespaces(
  binding: ns.binding.to_string(),
  })
  } else {
  - failure::bail!("In order to preview a worker with KV namespaces, you must designate a preview_id for each KV namespace you'd like to preview.")
  + failure::bail!("In order to preview a worker with KV namespaces, you must designate a preview_id in your configuration file for each KV namespace you'd like to preview.")
  }
  } else if let Some(id) = &ns.id {
  Ok(KvNamespace {
  