Creates a Pandoc's markdown format footnote.
pandoc.footnote.return(x)By default this function outputs (see: cat) the result. If you would want to catch the result instead, then call the function ending in .return.
character vector
John MacFarlane (2012): _Pandoc User's Guide_. https://johnmacfarlane.net/pandoc/README.html
pandoc.footnote('Automatically numbered footnote, right?')
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