Editorial: Narrowing an assertion in SuperCall: super Arguments (tc39…

…#3466)

spec.html

@@ -10695,7 +10695,7 @@ <h1>Function Environment Records</h1>
                 [[NewTarget]]
               </td>
               <td>
-                an Object or *undefined*
+                a constructor or *undefined*
               </td>
               <td>
                 If this Environment Record was created by the [[Construct]] internal method, [[NewTarget]] is the value of the [[Construct]] _newTarget_ parameter. Otherwise, its value is *undefined*.
@@ -19494,7 +19494,7 @@ <h1>Runtime Semantics: Evaluation</h1>
         <emu-grammar>SuperCall : `super` Arguments</emu-grammar>
         <emu-alg>
           1. Let _newTarget_ be GetNewTarget().
-          1. Assert: _newTarget_ is an Object.
+          1. Assert: _newTarget_ is a constructor.
           1. Let _func_ be GetSuperConstructor().
           1. Let _argList_ be ? ArgumentListEvaluation of |Arguments|.
           1. If IsConstructor(_func_) is *false*, throw a *TypeError* exception.