docs: add a performance tip to ak.transform docstring
#3334
| Job | Run time |
|---|---|
| 39s | |
| 6m 25s | |
| 7m 51s | |
| 6m 38s | |
| 21m 33s |
ak.transform docstring
#3334
| Job | Run time |
|---|---|
| 39s | |
| 6m 25s | |
| 7m 51s | |
| 6m 38s | |
| 21m 33s |