title: Reference package vignettes with Roxygen2
body: <p>So, I'd like to reference one of my package vignettes inside the roxygen2 comments of a function but I'm having a hard time understanding how to do it.</p>
  
  <p>More generally, how do we reference documents inside <code>/inst/doc</code>? E.g. I'd like to reference <code>/inst/doc/mypdf.pdf</code> inside the roxygen2 comments for <code>myFunc</code>. What would that look like? Is it even possible?</p>