Fix ApiDemo for transitions

The demo used an obsolete/wrong tag name for TransitionSet
(set, instead of the correct transitionSet). This caused the demo
to crash at runtime and to produce incorrect example docs in the
Transition reference pages.

Issue #11346546 Transition ApiDemo crashes

Change-Id: I12142870ac4f7412e5809b9cdad3ca3015449d77
diff --git a/samples/ApiDemos/res/transition/changebounds_fadein_together.xml b/samples/ApiDemos/res/transition/changebounds_fadein_together.xml
index c0bb26f..3a35653 100644
--- a/samples/ApiDemos/res/transition/changebounds_fadein_together.xml
+++ b/samples/ApiDemos/res/transition/changebounds_fadein_together.xml
@@ -13,11 +13,11 @@
      See the License for the specific language governing permissions and
      limitations under the License.
 -->
-<set xmlns:android="http://schemas.android.com/apk/res/android">
+<transitionSet xmlns:android="http://schemas.android.com/apk/res/android">
     <changeBounds/>
     <fade android:fadingMode="fade_in" >
         <targets>
             <target android:targetId="@id/grayscaleContainer" />
         </targets>
     </fade>
-</set>
+</transitionSet>
diff --git a/samples/ApiDemos/res/transition/changebounds_fadeout_sequential.xml b/samples/ApiDemos/res/transition/changebounds_fadeout_sequential.xml
index df36306..4734135 100644
--- a/samples/ApiDemos/res/transition/changebounds_fadeout_sequential.xml
+++ b/samples/ApiDemos/res/transition/changebounds_fadeout_sequential.xml
@@ -14,7 +14,7 @@
      limitations under the License.
 -->
 <!-- BEGIN_INCLUDE(TransitionSet) -->
-<set xmlns:android="http://schemas.android.com/apk/res/android"
+<transitionSet xmlns:android="http://schemas.android.com/apk/res/android"
      android:transitionOrdering="sequential">
     <changeBounds/>
     <fade android:fadingMode="fade_out" >
@@ -22,5 +22,5 @@
             <target android:targetId="@id/grayscaleContainer" />
         </targets>
     </fade>
-</set>
+</transitionSet>
 <!-- END_INCLUDE(TransitionSet) -->