Update index.html

index.html

@@ -494,7 +494,7 @@ <h3>
             <aside class="note">
               <p>
                 An explicit direction value such as "[=text-direction/rtl=]" or
-                "[=text-direction/ltr=]" is preferred to relying on
+                "[=text-direction/ltr=]" is preferred to relying on the default of
                 "[=text-direction/auto=]".
               </p>
             </aside>