add comments

Author: petamoriken

lib/internal/per_context/domexception.js

@@ -51,6 +51,9 @@ const disusedNamesSet = new SafeSet()
 
 class DOMException {
   constructor(message = '', options = 'Error') {
+    // The DOMException class must not inherit from the Error class,
+    // but its instance inherit from Error.prototype.
+    // The stack property and [[ErrorData]] internal slot are given.
     const error = ReflectConstruct(Error, [], new.target);
 
     if (options && typeof options === 'object') {