Update index.html

Author: mbgower

guidelines/index.html

@@ -763,7 +763,7 @@ <h1>Glossary</h1>
                 <dt data-include="terms/20/user-controllable.html" data-include-replace="true"></dt>
 
                 <dt data-include="terms/20/user-interface-component.html" data-include-replace="true"></dt>
-                
+
                 <dt data-include="terms/21/user-inactivity.html" data-include-replace="true"></dt>
 
                 <dt data-include="terms/20/video.html" data-include-replace="true"></dt>