Editorial: Call out async-from-sync iterators as internal (#3313)

spec.html

@@ -45963,7 +45963,7 @@ <h1>%AsyncIteratorPrototype% [ @@asyncIterator ] ( )</h1>
 
     <emu-clause id="sec-async-from-sync-iterator-objects">
       <h1>Async-from-Sync Iterator Objects</h1>
-      <p>An Async-from-Sync Iterator object is an async iterator that adapts a specific synchronous iterator. There is not a named constructor for Async-from-Sync Iterator objects. Instead, Async-from-Sync iterator objects are created by the CreateAsyncFromSyncIterator abstract operation as needed.</p>
+      <p>An Async-from-Sync Iterator object is an async iterator that adapts a specific synchronous iterator. Async-from-Sync Iterator objects are never directly accessible to ECMAScript code. There is not a named constructor for Async-from-Sync Iterator objects. Instead, Async-from-Sync iterator objects are created by the CreateAsyncFromSyncIterator abstract operation as needed.</p>
 
       <emu-clause id="sec-createasyncfromsynciterator" type="abstract operation">
         <h1>
@@ -45991,6 +45991,7 @@ <h1>The %AsyncFromSyncIteratorPrototype% Object</h1>
           <li>has properties that are inherited by all Async-from-Sync Iterator Objects.</li>
           <li>is an ordinary object.</li>
           <li>has a [[Prototype]] internal slot whose value is %AsyncIteratorPrototype%.</li>
+          <li>is never directly accessible to ECMAScript code.</li>
           <li>has the following properties:</li>
         </ul>
 
@@ -46065,7 +46066,7 @@ <h1>%AsyncFromSyncIteratorPrototype%.throw ( [ _value_ ] )</h1>
 
       <emu-clause id="sec-properties-of-async-from-sync-iterator-instances">
         <h1>Properties of Async-from-Sync Iterator Instances</h1>
-        <p>Async-from-Sync Iterator instances are ordinary objects that inherit properties from the %AsyncFromSyncIteratorPrototype% intrinsic object. Async-from-Sync Iterator instances are initially created with the internal slots listed in <emu-xref href="#table-async-from-sync-iterator-internal-slots"></emu-xref>. Async-from-Sync Iterator instances are not directly observable from ECMAScript code.</p>
+        <p>Async-from-Sync Iterator instances are ordinary objects that inherit properties from the %AsyncFromSyncIteratorPrototype% intrinsic object. Async-from-Sync Iterator instances are initially created with the internal slots listed in <emu-xref href="#table-async-from-sync-iterator-internal-slots"></emu-xref>.</p>
         <emu-table id="table-async-from-sync-iterator-internal-slots" caption="Internal Slots of Async-from-Sync Iterator Instances">
           <table>
             <thead>