Correct boundary_worker resource example (#438)

* Correct `boundary_worker` resource example

* regenerate docs

examples/resources/boundary_worker/resource.tf

@@ -4,9 +4,9 @@ resource "boundary_worker" "controller_led" {
   description = "self managed worker with controller led auth"
 }
 
-resource "boundary_self_managed_worker" "worker_led" {
+resource "boundary_worker" "worker_led" {
   scope_id                    = "global"
   name                        = "worker 2"
   description                 = "self managed worker with worker led auth"
   worker_generated_auth_token = var.worker_generated_auth_token
-}
+}