Update javascript.adoc (#759)

Processor declaration is not required anymore
diff --git a/docs/modules/languages/pages/javascript.adoc b/docs/modules/languages/pages/javascript.adoc
index 597825f..e94f33e 100644
--- a/docs/modules/languages/pages/javascript.adoc
+++ b/docs/modules/languages/pages/javascript.adoc
@@ -10,14 +10,12 @@
 [source,js]
 .hello.js
 ----
-const Processor = Java.extend(Java.type("org.apache.camel.Processor"));
-
 function proc(e) {
     e.getIn().setBody('Hello Camel K!')
 }
 
 from('timer:tick')
-    .process(new Processor(proc))
+    .process(proc)
     .to('log:info')
 ----