Editorial: fix an invariant for [[GetOwnProperty]] (#3254)

spec.html

@@ -3110,7 +3110,7 @@ <h2>[[GetOwnProperty]] ( _P_ )</h2>
             If _P_ is described as a non-configurable, non-writable own data property, all future calls to [[GetOwnProperty]] ( _P_ ) must return Property Descriptor whose [[Value]] is SameValue as _P_'s [[Value]] attribute.
           </li>
           <li>
-            If _P_'s attributes other than [[Writable]] may change over time or if the property might be deleted, then _P_'s [[Configurable]] attribute must be *true*.
+            If _P_'s attributes other than [[Writable]] and [[Value]] may change over time, or if the property might be deleted, then _P_'s [[Configurable]] attribute must be *true*.
           </li>
           <li>
             If the [[Writable]] attribute may change from *false* to *true*, then the [[Configurable]] attribute must be *true*.