fix output in Object.assign() example

Something looked off about this so I did a quick check in node.
You must have been distracted at the time of writing :)

Author: DJTB

README.md

@@ -504,7 +504,7 @@ function createMenu(config) {
     cancellable: true
   }, config);
 
-  // config now equals: {title: "Foo", body: "Bar", buttonText: "Baz", cancellable: true}
+  // config now equals: {title: "Order", body: "Bar", buttonText: "Send", cancellable: true}
   // ...
 }