minor typos and formatting fixes in documentation (tidyverse#4555)

Author: stragu

R/fortify-map.r

@@ -39,16 +39,16 @@ fortify.map <- function(model, data, ...) {
 
 #' Create a data frame of map data
 #'
-#' Easily turn data from the \pkg{maps} package in to a data frame suitable
+#' Easily turn data from the \pkg{maps} package into a data frame suitable
 #' for plotting with ggplot2.
 #'
-#' @param map name of map provided by the \pkg{maps} package.  These
+#' @param map name of map provided by the \pkg{maps} package. These
 #'   include [maps::county()], [maps::france()],
 #'   [maps::italy()], [maps::nz()],
 #'   [maps::state()], [maps::usa()],
 #'   [maps::world()], [maps::world2()].
-#' @param region name of subregions to include.  Defaults to `.` which
-#'   includes all subregion.  See documentation for [maps::map()]
+#' @param region name(s) of subregion(s) to include. Defaults to `.` which
+#'   includes all subregions. See documentation for [maps::map()]
 #'   for more details.
 #' @param exact should the `region` be treated as a regular expression
 #'   (`FALSE`) or as a fixed string (`TRUE`).
@@ -82,8 +82,8 @@ map_data <- function(map, region = ".", exact = FALSE, ...) {
 
 #' Create a layer of map borders
 #'
-#' This is a quick and dirty way to get map data (from the maps package)
-#' on to your plot. This is a good place to start if you need some crude
+#' This is a quick and dirty way to get map data (from the \pkg{maps} package)
+#' onto your plot. This is a good place to start if you need some crude
 #' reference lines, but you'll typically want something more sophisticated
 #' for communication graphics.
 #'