gh-141617: clarify concurrent.futures.ThreadPoolExecutor deadlock example
#185053
| Job | Run time |
|---|---|
| 21s | |
| 13s | |
| 2m 18s | |
| 0s | |
| 2m 11s | |
| 0s | |
| 0s | |
| 6m 2s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 2s | |
| 11m 7s |