Remove ML studio classic Next step

Preparing for ML studio docs to be retired/archive this coming November

Author: lgayhardt

articles/data-factory/transform-data-using-spark.md

@@ -124,5 +124,4 @@ See the following articles that explain how to transform data in other ways:
 * [Hadoop Streaming activity](transform-data-using-hadoop-streaming.md)
 * [Spark activity](transform-data-using-spark.md)
 * [.NET custom activity](transform-data-using-dotnet-custom-activity.md)
-* [ML Studio (classic) Batch Execution activity](transform-data-using-machine-learning.md)
 * [Stored procedure activity](transform-data-using-stored-procedure.md)