Update overview-what-is-azure-machine-learning.md

Removed redundant preview tag and disclaimer for AML Spark.

Author: ynpandey

articles/machine-learning/overview-what-is-azure-machine-learning.md

@@ -156,12 +156,7 @@ Supported via Azure Machine Learning Kubernetes, Azure Machine Learning compute
 * TensorFlow
 * MPI
 
-The MPI distribution can be used for Horovod or custom multinode logic. Additionally, Apache Spark is supported via Azure Synapse Analytics Spark clusters (preview).
-
-> [!IMPORTANT]
-> Using Apache Spark via Azure Synapse Analytics Spark clusters is in public preview.
-> The preview version is provided without a service level agreement, and it's not recommended for production workloads. Certain features might not be supported or might have constrained capabilities.
-> For more information, see [Supplemental Terms of Use for Microsoft Azure Previews](https://azure.microsoft.com/support/legal/preview-supplemental-terms/).
+The MPI distribution can be used for Horovod or custom multinode logic. Additionally, Apache Spark is supported via [serverless Spark compute and attached Synapse Spark pool](apache-spark-azure-ml-concepts.md) that leverage Azure Synapse Analytics Spark clusters.
 
 See [Distributed training with Azure Machine Learning](concept-distributed-training.md).