Fix typo in docs/options.html

docs/options.html

@@ -1147,7 +1147,7 @@ DataAdapter.query = function (params, callback) {
     </p>
 
 <pre class="prettyprint linenums">
-$.fn.select2.default2.set("theme", "classic");
+$.fn.select2.defaults.set("theme", "classic");
 </pre>
 
     <p>