Update worker-performance.mdx (#4266)

Author: brianmacdonald-temporal

docs/develop/worker-performance.mdx

@@ -315,9 +315,9 @@ worker = Temporalio::Worker.new(
   workflows: [MyWorkflow],
   activities: [MyActivity],
 
-  workflow_task_poller_behavior: Temporalio::Worker::PollerBehaviorAutoscaling.new,
-  activity_task_poller_behavior: Temporalio::Worker::PollerBehaviorAutoscaling.new,
-  nexus_task_poller_behavior: Temporalio::Worker::PollerBehaviorAutoscaling.new,
+  workflow_task_poller_behavior: Temporalio::Worker::PollerBehavior::Autoscaling.new,
+  activity_task_poller_behavior: Temporalio::Worker::PollerBehavior::Autoscaling.new,
+  nexus_task_poller_behavior: Temporalio::Worker::PollerBehavior::Autoscaling.new,
 )
 
 ```