Letter 's' from codespell-project#436

Continuing to separate ~codespell-project#428~ codespell-project#436 in to separate PRs for each letter. Also removed/corrected some entries that were not relevant/precise and augmented others. This PR has been sorted as well. Continuing to separate ~codespell-project#428~ codespell-project#436 in to separate PRs for each letter. Also removed/corrected some entries that were not relevant/precise and augmented others. This PR has been sorted as well.