Fix image order in carousel example

When the screen is shrunk below the md threshold, all the featurette columns stack.
However, since the second featurette is "backwards", when stacked the second featurette
looked awkward as the image came before the heading.

docs/examples/carousel/index.html

@@ -167,13 +167,13 @@
       <hr class="featurette-divider">
 
       <div class="row featurette">
-        <div class="col-md-5">
-          <img class="featurette-image img-responsive center-block" data-src="holder.js/500x500/auto" alt="Generic placeholder image">
-        </div>
-        <div class="col-md-7">
+        <div class="col-md-7 col-md-push-5">
           <h2 class="featurette-heading">Oh yeah, it's that good. <span class="text-muted">See for yourself.</span></h2>
           <p class="lead">Donec ullamcorper nulla non metus auctor fringilla. Vestibulum id ligula porta felis euismod semper. Praesent commodo cursus magna, vel scelerisque nisl consectetur. Fusce dapibus, tellus ac cursus commodo.</p>
         </div>
+        <div class="col-md-5 col-md-pull-7">
+          <img class="featurette-image img-responsive center-block" data-src="holder.js/500x500/auto" alt="Generic placeholder image">
+        </div>
       </div>
 
       <hr class="featurette-divider">