docs: improve doctests for ndarray instances in `ndarray/dcusum`#10034

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AyushiJain18270 wants to merge 3 commits intostdlib-js:developfrom

AyushiJain18270:third-branch

Commits on Feb 1, 2026

Commits on Apr 10, 2026

Merge remote-tracking branch 'upstream/develop' into third-branch
stdlib-bot
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