Fix the assertion in setup the resource timing entry. (#331)

Author: jeremyroman

index.html

@@ -1093,8 +1093,8 @@ <h2>
           |bodyInfo|, perform the following steps:
         </p>
         <ol>
-          <li>Assert that |cacheMode| is the empty string or
-          "<code>local</code>".
+          <li>Assert that |cacheMode| is the empty string, "<code>local</code>",
+          or "<code>validated</code>".
           </li>
           <li>Set |entry|'s <a data-for="PerformanceResourceTiming">initiator
           type</a> to |initiatorType|.