Fix up react xref

Author: marcoscaceres

index.html

@@ -936,9 +936,9 @@ <h2>
         </li>
       </ol>
       <p>
-        [=React=] to a [=document=] |doc|'s [=pending fullscreen request
-        promise=]. When the promise is [=reject|rejected=], run the following
-        steps:
+        [=promise/React=] to a [=document=] |doc|'s [=pending fullscreen
+        request promise=]. When the promise is [=reject|rejected=], run the
+        following steps:
       </p>
       <ol class="algorithm">
         <li>If |doc|'s {{Document/[[orientationPendingPromise]]}} is not