Add polyfill link for array values, array keys and array entries (mdn…

…#3800)

Co-authored-by: Michael[tm] Smith <[email protected]>

files/en-us/web/javascript/reference/global_objects/array/entries/index.html

@@ -84,4 +84,5 @@ <h2 id="See_also">See also</h2>
   <li><a href="/en-US/docs/Web/JavaScript/Reference/Statements/for...of">for...of</a></li>
   <li><a href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols">Iteration
       protocols</a></li>
+  <li><a href="https://github.com/behnammodi/polyfill/blob/master/array.polyfill.js">A polyfill</a></li>
 </ul>

files/en-us/web/javascript/reference/global_objects/array/keys/index.html

@@ -70,4 +70,5 @@ <h2 id="See_also">See also</h2>
   <li><a
       href="/en-US/docs/Web/JavaScript/Reference/Iteration_protocols">Iteration protocols</a>
   </li>
+  <li><a href="https://github.com/behnammodi/polyfill/blob/master/array.polyfill.js">A polyfill</a></li>
 </ul>

files/en-us/web/javascript/reference/global_objects/array/values/index.html

@@ -124,4 +124,5 @@ <h2 id="See_also">See also</h2>
   <li>{{jsxref("Array.prototype.forEach()")}}</li>
   <li>{{jsxref("Array.prototype.every()")}}</li>
   <li>{{jsxref("Array.prototype.some()")}}</li>
+  <li><a href="https://github.com/behnammodi/polyfill/blob/master/array.polyfill.js">A polyfill</a></li>
 </ul>