Add missing quote for the initial value of the global object property

spec.html

@@ -189,7 +189,7 @@ <h1>The Iterator Constructor</h1>
         <p>The <dfn>Iterator</dfn> constructor:</p>
         <ul>
           <li>is <dfn>%Iterator%</dfn>.</li>
-          <li>is the initial value of the *Iterator* property of the global object.</li>
+          <li>is the initial value of the *"Iterator"* property of the global object.</li>
           <li>is designed to be subclassable. It may be used as the value of an *extends* clause of a class definition.</li>
         </ul>