Enhance docs, add tests in QuickSortLinkedList (#5998)
          
            #2133
        
      | Job | Run time | 
|---|---|
| 2m 52s | |
| 2m 52s | 
QuickSortLinkedList (#5998)
          
            #2133
        
| Job | Run time | 
|---|---|
| 2m 52s | |
| 2m 52s |