docs: improve doctests for ndarray instances in `blas/ext/ndarray/dsorthp` #27304

Job	Run time
Check for EditorConfig label	0s
Check for stale label	0s
Check for project conventions label	0s
Check for contributor guidelines label	0s
Check for already resolved label	-6s
Check for spam label	-7s
Check for Git History label	-9s
	-22s

Provide feedback