docs: clarify distinct in difference(), add examples
#26296
| Job | Run time |
|---|---|
| 2m 33s | |
| 3m 51s | |
| 3m 59s | |
| 33s | |
| 3m 31s | |
| 3m 33s | |
| 4m 34s | |
| 3m 50s | |
| 3m 36s | |
| 3m 46s | |
| 5m 48s | |
| 5m 1s | |
| 6m 2s | |
| 5m 22s | |
| 6m 17s | |
| 5m 18s | |
| 6m 23s | |
| 6m 19s | |
| 1h 20m 16s |