fix link

docs/modules/tutorials/pages/beginner/hello_simpleapplication.adoc

@@ -7,7 +7,7 @@
 
 *Prerequisites:* This tutorial assumes that you have xref:ROOT:documentation.adoc#install[downloaded the jMonkeyEngine SDK].
 
-In this tutorial series, we assume that you use the jMonkeyEngine xref:ROOT:sdk.adoc[SDK]. As an intermediate or advanced Java developer, you will quickly see that, in general, you can develop jMonkeyEngine code in any integrated development environment (NetBeans IDE, Eclipse, IntelliJ) or even from the xref:ROOT:jme3/simpleapplication_from_the_commandline.adoc[command line].
+In this tutorial series, we assume that you use the jMonkeyEngine xref:sdk:sdk.adoc[SDK]. As an intermediate or advanced Java developer, you will quickly see that, in general, you can develop jMonkeyEngine code in any integrated development environment (NetBeans IDE, Eclipse, IntelliJ) or even from the xref:ROOT:jme3/simpleapplication_from_the_commandline.adoc[command line].
 
 OK, let's get ready to create our first jMonkeyEngine3 application.