Markup: Put 2 emu-clause attributes in quotes

(We always quote element attributes -- see PR tc39#1868)

spec.html

@@ -8100,15 +8100,15 @@ <h1>Execution</h1>
     <emu-clause id="sec-weakref-host-hooks">
       <h1>Host Hooks</h1>
 
-      <emu-clause id="sec-host-cleanup-finalization-registry" aoid=HostEnqueueFinalizationRegistryCleanupJob>
+      <emu-clause id="sec-host-cleanup-finalization-registry" aoid="HostEnqueueFinalizationRegistryCleanupJob">
         <h1>HostEnqueueFinalizationRegistryCleanupJob ( _finalizationRegistry_ )</h1>
 
         <p>The abstract operation HostEnqueueFinalizationRegistryCleanupJob takes argument _finalizationRegistry_ (a FinalizationRegistry). HostEnqueueFinalizationRegistryCleanupJob is an implementation-defined abstract operation that is expected to call CleanupFinalizationRegistry(_finalizationRegistry_) at some point in the future, if possible. The host's responsibility is to make this call at a time which does not interrupt synchronous ECMAScript code execution.</p>
       </emu-clause>
     </emu-clause>
   </emu-clause>
 
-  <emu-clause id="sec-clear-kept-objects" aoid=ClearKeptObjects>
+  <emu-clause id="sec-clear-kept-objects" aoid="ClearKeptObjects">
     <h1>ClearKeptObjects ( )</h1>
     <p>The abstract operation ClearKeptObjects takes no arguments. ECMAScript implementations are expected to call ClearKeptObjects when a synchronous sequence of ECMAScript executions completes. It performs the following steps when called:</p>
     <emu-alg>