docs: improve doctests for ndarray instances in blas/ext/base/ndarray/scusumkbn2
#11220
| Job | Run time |
|---|---|
| 7s | |
| 7s |
blas/ext/base/ndarray/scusumkbn2
#11220
| Job | Run time |
|---|---|
| 7s | |
| 7s |