fix radio-single names in demo file

Author: micrum

demo/index.html

@@ -179,7 +179,7 @@ <h2>Radios</h2>
                         <label></label>
                     </div>
                     <div class="radio radio-success radio-single">
-                        <input type="radio" id="singleRadio2" value="option2" name="radioSingle2" checked aria-label="Single radio Two">
+                        <input type="radio" id="singleRadio2" value="option2" name="radioSingle1" checked aria-label="Single radio Two">
                         <label></label>
                     </div>
                     <p>Inline radios</p>