Fix TransitionSet javadoc

The attribute is called transitionOrdering instead of ordering.

Bug: 71052190
Test: Only doc change
Change-Id: I0cf0073905123f38468c7ea01f55211fbc82a33b
diff --git a/transition/src/main/java/android/support/transition/TransitionSet.java b/transition/src/main/java/android/support/transition/TransitionSet.java
index 404245a..12113e7 100644
--- a/transition/src/main/java/android/support/transition/TransitionSet.java
+++ b/transition/src/main/java/android/support/transition/TransitionSet.java
@@ -51,7 +51,7 @@
  * 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;