Fix TransitionSet javadoc to use transitionOrdering attribute.

Bug 27056771

Change-Id: Idb00d7e49857f6aed88a898edd957b5202581a2f
diff --git a/core/java/android/transition/TransitionSet.java b/core/java/android/transition/TransitionSet.java
index 09d2c69..885865c 100644
--- a/core/java/android/transition/TransitionSet.java
+++ b/core/java/android/transition/TransitionSet.java
@@ -46,7 +46,7 @@
  * transition on the affected view targets:</p>
  * <pre>
  *     &lt;transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
- *             android:ordering="sequential"&gt;
+ *             android:transitionOrdering="sequential"&gt;
  *         &lt;fade/&gt;
  *         &lt;changeBounds/&gt;
  *     &lt;/transitionSet&gt;