sage

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gh-38307: fix some typos ; mostly in graphs just fixing a few typos found using codespell ### :memo: Checklist - [x] The title is concise and informative. - [x] The description explains in detail what this PR is about. URL: https://github.com/sagemath/sage/pull/38307 Reported by: Frédéric Chapoton Reviewer(s): Matthias Köppe