org: file-desc

 
 14.8.2.4 ‘:file-desc’
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 The value of the ‘:file-desc’ header argument is used to provide a
 description for file code block results which are inserted as Org mode
 links (see SeeLink format).  If the ‘:file-desc’ header argument is
 given with no value the link path will be placed in both the “link” and
 the “description” portion of the Org mode link.