Update hello_node.adoc

Found and fixed broken table. There was no blank line between the last list item and the block attribute list.

src/docs/asciidoc/jme3/beginner/hello_node.adoc

@@ -117,6 +117,7 @@ Every JME3 application has a rootNode: Your game automatically inherits the `roo
 *  A Spatial contains the location, rotation, and scale of an object.
 *  A Spatial can be loaded, transformed, and saved.
 *  There are two types of Spatials: Nodes and Geometries.
+
 [cols="3", options="header"]
 |===