Add comment to explain purpose of folliwing lines

lib/scripts/linkwiz.js

@@ -299,6 +299,8 @@ var dw_linkwiz = {
         dw_linkwiz.$wiz.show();
         dw_linkwiz.$entry.focus();
         dw_linkwiz.autocomplete();
+
+        // Move the cursor to the end of the input
         var temp = dw_linkwiz.$entry.val();
         dw_linkwiz.$entry.val('');
         dw_linkwiz.$entry.val(temp);