Minor change in comment

Counting Sort/CountingSort.playground/Contents.swift

@@ -30,7 +30,7 @@ func countingSort(array: [Int]) throws -> [Int] {
   // Step 3
   // Place the element in the final array as per the number of elements before it
   // Loop through the array in reverse to keep the stability of the new array
-  // (i.e. 7, is at index 3 and 6, thus in sortedArray the position of 7 at index 3 should be before 7 at index 6
+  // i.e. 7, is at index 3 and 6, thus in sortedArray the position of 7 at index 3 should be before 7 at index 6
   var sortedArray = [Int](repeating: 0, count: array.count)
   for index in stride(from: array.count - 1, through: 0, by: -1) {
     let element = array[index]