Update preview.md

Author: sreekzz

articles/hdinsight-aks/preview.md

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+# Microsoft HDInsight on AKS preview information
+
 [!INCLUDE [retirement-notice](includes/retirement-notice.md)]
 
 [!INCLUDE [feature-in-preview](includes/feature-in-preview.md)]
 
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-# Microsoft HDInsight on AKS preview information
-
 Azure HDInsight on AKS is currently in public preview and may be substantially modified before it's released. Preview online service products and features aren't complete but are made available on a preview basis so that customers can get early access and provide feedback.
 
 This article describes the Azure HDInsight on AKS preview state, and provides disclaimers related to preview.