fix typo on button

Author: gwtnz

index.html

@@ -17,7 +17,7 @@
 <div class="container">
 <div class="jumbotron">
 <h1>Foo!</h1>
-<button class="btn btn-primary btn-lg">Fancy <i class="fa fa-automobile">foo icon on the button!</i></button>
+<button class="btn btn-primary btn-lg">Fancy <i class="fa fa-automobile"></i> car icon on the button!</button>
 </div>
 </div>