Feature/better docs cut double tenon

[JulzSk]

edited the docs for cut_double_tenon to a more prcise one and bumped the version one up

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✅ 9and3
❌ Julian Skop

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[9and3]

lgtm!

[9and3]

@jspaquet can we merge this @JulzSk signed the CLA with an old account but now should be good for future PR, same here #370 . Can we for merging these PRs? thanks!