[DOCS] update apache spark support version

Author: j143

_src/download.html

@@ -41,7 +41,7 @@ <h2>Downloads SystemDS</h2>
         <a href="https://www.apache.org/licenses/LICENSE-2.0">Apache License, version 2.0</a>. </p>
     </div>
     <div class="col col-12 content-group">
-      <h2>Download SystemDS {{ site.data.project.release_version }} for Spark 2.0.2 and above</h2>
+      <h2>Download SystemDS {{ site.data.project.release_version }} for Apache Spark 3.x and above</h2>
     </div>
 
     <div class="col col-12 content-group row">