docs: improve doctests for ndarray instances in blas/ext/base/ndarray/dcusumkbn2
#17838
| Job | Run time |
|---|---|
| 29s | |
| 29s |
blas/ext/base/ndarray/dcusumkbn2
#17838
| Job | Run time |
|---|---|
| 29s | |
| 29s |