fix: Replace Array.prototype.sort and update old isSorted method. (#39360)

* fix: Replace Array.prototype.sort and update old isSorted method.

* fix: Change name of function from 'checkInBuiltSort' to 'checkBuilitInSort'.

* fix: Change name of function from 'checkBuilitInSort' to 'isBuiltInSortUsed'.

curriculum/challenges/english/10-coding-interview-prep/data-structures/implement-heap-sort-with-a-min-heap.english.md

@@ -43,10 +43,11 @@ tests:
 
 ```js
 // check if array is sorted
-function isSorted(arr) {
-  var check = i =>
-    i == arr.length - 1 ? true : arr[i] > arr[i + 1] ? false : check(i + 1);
-  return check(0);
+function isSorted(a){
+  for(let i = 0; i < a.length - 1; i++)
+    if(a[i] > a[i + 1])
+      return false;
+  return true;
 }
 // generate a randomly filled array
 var array = new Array();