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/rosetta-code/sorting-algorithms-permutation-sort.english.md

@@ -91,8 +91,10 @@ function permutationSort(arr) {
     }
   }
 
-  function isSorted(a) {
-    for (var i = 1; i < a.length; i++) if (a[i - 1] > a[i]) return false;
+  function isSorted(a){
+    for(let i = 0; i < a.length - 1; i++)
+      if(a[i] > a[i + 1])
+        return false;
     return true;
   }