Update sorting/selection_sort_recursive.c

Co-authored-by: Ayaan Khan <ayaankhan98@gmail.com>

sorting/selection_sort_recursive.c

@@ -25,6 +25,7 @@ void swap(int *first, int *second)
  * @brief returned the index having minimum value using recursion
  * @param arr array to be sorted
  * @param size size of array
+* @return min_index index of element having minimum value.
 */
 int findIndex(const int *arr, const int size)
 {