Update logging.adoc

Updated link to current logger level javadoc.

src/docs/asciidoc/jme3/advanced/logging.adoc

@@ -62,7 +62,7 @@ As you see in the examples, you should phrase potentially “customer facing err
 ====
 
 
-More details about link:http://download.oracle.com/javase/6/docs/api/java/util/logging/Level.html[Java log levels] here.
+More details about link:http://docs.oracle.com/javase/8/docs/api/java/util/logging/Level.html[Java log levels] here.
 
 
 == Switching the Logger on and off