Update dnn link in documentation.

Author: arun-rajora

articles/machine-learning/how-to-configure-auto-train.md

@@ -698,7 +698,7 @@ limits:
 
 ### Distributed training for forecasting
 
-To learn how distributed training works for forecasting tasks, see our [forecasting at scale](concept-automl-forecasting-at-scale.md#distributed-dnn-training) article. To use distributed training for forecasting, you need to set the `training_mode`, `enable_dnn_training`, `max_nodes`, and optionally the `max_concurrent_trials` properties of the job object.
+To learn how distributed training works for forecasting tasks, see our [forecasting at scale](concept-automl-forecasting-at-scale.md#distributed-dnn-training-preview) article. To use distributed training for forecasting, you need to set the `training_mode`, `enable_dnn_training`, `max_nodes`, and optionally the `max_concurrent_trials` properties of the job object.
 
 Property | Description
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