Correct doc for print.ggplot, returns 'x' not 'data' (#4390)

NEWS.md

@@ -1,5 +1,8 @@
 # ggplot2 (development version)
 
+* Updated documentation for `print.ggplot` to reflect that it returns
+  the original plot, not the result of `ggplot_build()`. (@r2evans, #4390)
+
 * `scale_*_manual()` no longer displays extra legend keys, or changes their 
   order, when a named `values` argument has more items than the data. To display
   all `values` on the legend instead, use

R/plot.r

@@ -137,9 +137,7 @@ is.ggplot <- function(x) inherits(x, "ggplot")
 #' @param vp viewport to draw plot in
 #' @param ... other arguments not used by this method
 #' @keywords hplot
-#' @return Invisibly returns the result of [ggplot_build()], which
-#'   is a list with components that contain the plot itself, the data,
-#'   information about the scales, panels etc.
+#' @return Invisibly returns the original plot.
 #' @export
 #' @method print ggplot
 #' @examples