Update serialization.adoc

Fixed broken link.

src/docs/asciidoc/jme3/contributions/cubes/tools/serialization.adoc

@@ -62,7 +62,7 @@ a| <<jme3/advanced/networking#,Spidermonkey>>
 
 a| Files 
 a| The bytes are saved in a file, which can be loaded again next time. 
-a| link:http://docs.oracle.com/javase/1.4.2/docs/api/java/io/File.html[java.io.File] 
+a| link:http://docs.oracle.com/javase/tutorial/essential/io/fileio.html[java.io.File] 
 
 |===