Fix outdated reference link in runtime.js (#704)

* fix: modify outdated reference link

* Elaborate GeneratorResume doneResult() comment in runtime.js

Co-authored-by: Ben Newman <ben@benjamn.com>

packages/runtime/runtime.js

@@ -259,8 +259,9 @@ var runtime = (function (exports) {
           throw arg;
         }
 
-        // Be forgiving, per 25.3.3.3.3 of the spec:
-        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
+        // Be forgiving, per GeneratorResume behavior specified since ES2015:
+        // ES2015 spec, step 3: https://262.ecma-international.org/6.0/#sec-generatorresume
+        // Latest spec, step 2: https://tc39.es/ecma262/#sec-generatorresume
         return doneResult();
       }