This roclet is the workhorse of roxygen, producing the Rd files that document that functions in your package.
roxygen
Generally you will not call this function directly but will instead use roxygenise() specifying the rd roclet
rd_roclet()
vignette("rd", package = "roxygen2")
Other roclets: namespace_roclet, vignette_roclet
namespace_roclet
vignette_roclet