Core: Fixed typo.

Thanks jsgoupil

Author: scottgonzalez

ui/jquery.ui.core.js

@@ -214,7 +214,7 @@ $(function() {
 		div = body.appendChild( div = document.createElement( "div" ) );
 
 	// access offsetHeight before setting the style to prevent a layout bug
-	// in IE 9 which causes the elemnt to continue to take up space even
+	// in IE 9 which causes the element to continue to take up space even
 	// after it is removed from the DOM (#8026)
 	div.offsetHeight;