for ease with translation

Author: tanquar

src/examples/src/flight-booker/App/template.html

@@ -1,6 +1,6 @@
 <select v-model="flightType">
-  <option>one-way flight</option>
-  <option>return flight</option>
+  <option value="one-way flight">One-way Flight</option>
+  <option value="return flight">Return Flight</option>
 </select>
 
 <input type="date" v-model="departureDate" />