A few typos I spotted while reading the paper

[hugoledoux]

I'm your JOSS editor, in case you don't recognise me :)

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[mdtanker]

Thanks for catching those!

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[mdtanker]

Sorry I'm not exactly sure what happened, but I completely messed up the PR JOSS_paper and ended up having to manually add your corrections with a new commit. Should all be sorted now.