removed 'preview' from windows 2019 and ubuntu 18.04

Author: shivanissambare

articles/machine-learning/data-science-virtual-machine/dsvm-tools-data-platforms.md

@@ -25,7 +25,7 @@ The following data platform tools are supported on the DSVM.
 | | |
 | ------------- | ------------- |
 | What is it?   | A local relational database instance      |
-| Supported DSVM editions      | Windows: SQL Server 2017, Windows 2019 (Preview) : SQL Server 2019      |
+| Supported DSVM editions      | Windows 2016: SQL Server 2017, Windows 2019: SQL Server 2019      |
 | Typical uses      | Rapid development locally with smaller dataset <br/> Run In-database R   |
 | Links to samples      |    A small sample of a New York City dataset is loaded into the SQL database:<br/>  `nyctaxi` <br/> Jupyter sample showing Microsoft Machine Learning Server and in-database analytics can be found at:<br/> `~notebooks/SQL_R_Services_End_to_End_Tutorial.ipynb`  |
 | Related tools on the DSVM       | SQL Server Management Studio <br/> ODBC/JDBC drivers<br/> pyodbc, RODBC<br />Apache Drill      |