missing <sup>
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Former-commit-id: 481a1bf85620287513f4a9e38adf13c35c8e6773 [formerly 7249978c5293e9d7384ff2ae30525611e8234282]
Former-commit-id: f33b5f2b21dda81137c9bb12b0785024a7e2ebfd
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io