Remove Array.some() polyfill (mdn#12047)

Related to mdn#10072 and #12046

files/en-us/web/javascript/reference/global_objects/array/some/index.md

@@ -93,47 +93,6 @@ visits that element's index. Elements that are deleted are not visited.
 > **Note:** Calling this method on an empty array returns
 > `false` for any condition!
 
-## Polyfill
-
-`some()` was added to the ECMA-262 standard in the 5th edition,
-and it may not be present in all implementations of the standard. You can work around
-this by inserting the following code at the beginning of your scripts, allowing use of
-`some()` in implementations which do not natively support it.
-
-This algorithm is exactly the one specified in ECMA-262, 5th edition,
-assuming {{jsxref("Object")}} and {{jsxref("TypeError")}} have their original values and
-that `fun.call` evaluates to the original value of
-{{jsxref("Function.prototype.call()")}}.
-
-```js
-// Production steps of ECMA-262, Edition 5, 15.4.4.17
-// Reference: https://es5.github.io/#x15.4.4.17
-if (!Array.prototype.some) {
-  Array.prototype.some = function(fun, thisArg) {
-    'use strict';
-
-    if (this == null) {
-      throw new TypeError('Array.prototype.some called on null or undefined');
-    }
-
-    if (typeof fun !== 'function') {
-      throw new TypeError();
-    }
-
-    var t = Object(this);
-    var len = t.length >>> 0;
-
-    for (var i = 0; i < len; i++) {
-      if (i in t && fun.call(thisArg, t[i], i, t)) {
-        return true;
-      }
-    }
-
-    return false;
-  };
-}
-```
-
 ## Examples
 
 ### Testing value of array elements