Update broadcasting.md

Fixing listening to other Namespaced events example

broadcasting.md

@@ -529,7 +529,7 @@ You may have noticed in the examples above that we did not specify the full name
 Alternatively, you may prefix event classes with a `.` when subscribing to them using Echo. This will allow you to always specify the fully-qualified class name:
 
     Echo.channel('orders')
-        .listen('.Namespace.Event.Class', (e) => {
+        .listen('.Namespace\\Event\\Class', (e) => {
             //
         });