docs: follow-up fixes for commits merged to develop on 2026-07-06/07#13360

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Planeshifter wants to merge 3 commits into

philipp/fix-commit-review-2026-07-07

Commits on Jul 7, 2026

docs: correct `@throws` phrasing in `stats/incr/nancv`
claude
committed
docs: remove unused lint suppressions in `blas/ext/base/gfirst-index-less-than`
claude
committed
style: add missing whitespace inside parentheses in `fft/base/fftpack/sinti` examples
claude
committed