use sql syntax highlighting

use sql syntax highlighting

Author: azaricstefan

articles/synapse-analytics/get-started-analyze-sql-on-demand.md

@@ -30,7 +30,7 @@ In this section, you'll use a serverless SQL pool to analyze NYC Taxi data in an
 1. Create a new SQL script.
 1. Paste the following code into the script.
 
-    ```
+    ```sql
     SELECT
         TOP 100 *
     FROM