Editorial: wrap asserts in <span>

These were the only case-sensitive matches for "assert:".

Author: foolip

source

@@ -101999,10 +101999,10 @@ interface <dfn interface>NavigationDestination</dfn> {
     state</span> is "<code data-x="">intercepted</code>", then:</p>
 
     <ol>
-     <li><p>Assert: <var>didFulfill</var> is false.</p></li>
+     <li><p><span>Assert</span>: <var>didFulfill</var> is false.</p></li>
 
      <li>
-      <p>Assert: <var>event</var>'s <span
+      <p><span>Assert</span>: <var>event</var>'s <span
       data-x="concept-NavigateEvent-navigation-precommit-handler-list">navigation precommit handler
       list</span> <span data-x="list is empty">is not empty</span>.</p>