fix: update data-fullscreen to fullscreen

Author: frankpagan

Diff for: docs/index.html

@@ -124,7 +124,7 @@ <h2 class="padding:5px_0px">Demo</h2>
     				  	     class="margin-right:10px">
     				  	    <i class="fas fa-external-link-alt"></i>
     				     </a>        
-    				     <a class="margin-right:5px" data-fullscreen target="#playground-1"><i class="fas fa-expand"></i></a>
+    				     <a class="margin-right:5px" fullscreen target="#playground-1"><i class="fas fa-expand"></i></a>
     			        </div>
 
     			        <div class="svRow">