Fixes typo on download page

Changed chose to choose spelling error on download template

docs/templates/pages/download.mustache

@@ -17,7 +17,7 @@
   <div class="page-header">
     <a class="btn btn-small pull-right toggle-all" href="#">{{_i}}Toggle all{{/i}}</a>
     <h1>
-      {{_i}}1. Chose components{{/i}}
+      {{_i}}1. Choose components{{/i}}
       <small>{{_i}}Get just the CSS you need{{/i}}</small>
     </h1>
   </div>