Merge pull request #349 from juukie/fix-typo-transition

Add missing transition parameter

Author: yyx990803

docs/en/pipeline/data.md

@@ -59,7 +59,7 @@ By returning a Promise:
 
 ``` js
 route: {
-  data: function () {
+  data: function (transition) {
     return messageService
       .fetch(transition.to.params.messageId)
       .then(function (message) {