docs(demos): update datetime demo to include year

Author: brandyscarney

demos/src/datetime/page.html

@@ -39,7 +39,7 @@
 
     <ion-item>
       <ion-label>Chrome</ion-label>
-      <ion-datetime displayFormat="DDDD MMM D" min="2005" max="2016" [(ngModel)]="chromeReleased"></ion-datetime>
+      <ion-datetime displayFormat="DDDD MMM D, YYYY" min="2005" max="2016" [(ngModel)]="chromeReleased"></ion-datetime>
     </ion-item>
   </ion-list>