assert: apply minor refactoring

* Remove comment referring to the CommonJS Unit Testing 1.0 spec. This
  module is no longer intended to comply with that spec.
* Remove puzzling "THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!"
  comment. No doubt, it made sense at one time.
* Favor `===` over `==` in two places.

PR-URL: https://github.com/nodejs/node/pull/11511
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

lib/assert.js

@@ -1,7 +1,3 @@
-// http://wiki.commonjs.org/wiki/Unit_Testing/1.0
-//
-// THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
-//
 // Originally from narwhal.js (http://narwhaljs.org)
 // Copyright (c) 2009 Thomas Robinson <280north.com>
 //
@@ -213,7 +209,7 @@ function _deepEqual(actual, expected, strict, memos) {
 }
 
 function isArguments(object) {
-  return Object.prototype.toString.call(object) == '[object Arguments]';
+  return Object.prototype.toString.call(object) === '[object Arguments]';
 }
 
 function objEquiv(a, b, strict, actualVisitedObjects) {
@@ -299,7 +295,7 @@ function expectedException(actual, expected) {
     return false;
   }
 
-  if (Object.prototype.toString.call(expected) == '[object RegExp]') {
+  if (Object.prototype.toString.call(expected) === '[object RegExp]') {
     return expected.test(actual);
   }