Editorial: remove redundant to

source

@@ -60419,7 +60419,7 @@ interface <dfn interface>HTMLDetailsElement</dfn> : <span>HTMLElement</span> {
   attribute is specified, its value must not be the empty string.</p>
 
   <p>Before using this feature, authors should consider whether this grouping of related
-  <code>details</code> elements into an exclusive accordion is helpful or harmful to to users.
+  <code>details</code> elements into an exclusive accordion is helpful or harmful to users.
   While using an exclusive accordion can reduce the maximum amount of space that a set of content
   can occupy, it can also frustrate users who have to open many items to find what they want or
   users who want to look at the contents of multiple items at the same time.</p>