update example text

Author: jackiedinh6

example/index.html

@@ -118,7 +118,7 @@ <h5 class="title"><a href="">Demo Web Application</a></h5>
 
       <div class="col-md-6">
         <div id="joinedRoomSectionId">
-          <p><span>Publish your local camera. If no camera available, a sample video will be played.</span></p>
+          <p><span>Publish your local camera. If no camera available, a sample video will be used as media source.</span></p>
         </div>
         <button id="publishCameraBtn" type="button" class="btn-get-started">Publish Stream</button>
       </div>