Learn the full details in vignette('rd-formatting').
Other less frequently used tags:
@md: Force markdown processing for a block.
@noMd: Suppress markdown processing for a block.
@section ${1:section title}: : Add an arbitrary section to the documentation. Now generally superseded in favour of using a level 1 heading.
#' @md
#' @noMd
#' @section ${1:section title}: