Properly link packages in roxygen

[brookslogan]

We have CHECKs complaining about using e.g. {epiprocess} [in roxygen comments; this seems to matter for downlit behavior for our alternatives, though the CHECK complaint is about the .Rd, not related to downlit]. Three approaches:

• Use `{epiprocess}` --- roxygen2's to \code{{epiprocess}}, which doesn't trigger CHECK.
  • In both normal help and downlit: no linking.
• Use \code{\link[epiprocess:epiprocess]{\{epiprocess\}}}
  • In both normal help and downlit: links to ?epiprocess::epiprocess in a matching medium (normal help display or pkgdown site)... seems like a good approach but ?epiprocess::epiprocess seems very outdated right now.
• Use [`{epiprocess}`](https://cmu-delphi.github.io/epiprocess/reference/epiprocess.html) or, equivalently, `r paste0("[\u0060{epiprocess}\u0060](", downlit::autolink_url("epiprocess::epiprocess"), ")")`
  • In both normal help and downlit: links to package landing page URL. Note this might feel a little weird for the normal help file.

Second approach should probably only happen after the epiprocess package-level documentation topic has been updated.

[dshemetov]

Wait, I think option 1 results in plain text linking? I'm using it in epiprocess.

[brookslogan]

What is "plain text linking"?

In option 1., I did expect downlit to make it a link, but it doesn't actually appear to do that; maybe it doesn't process the function reference in the same way as the vignettes. All these CHECK complaints are coming from stuff in roxygen comments / function reference, not vignettes.