add reference to ?recordPlot

git-svn-id: https://svn.r-project.org/R/trunk@84839 00db46b3-68df-0310-9c12-caf00c1e9a41

src/library/grDevices/man/recordplot.Rd

@@ -67,6 +67,11 @@ replayPlot(x, reloadPkgs=FALSE)
 
   \code{replayPlot} has no return value.
 }
+\references{
+  Murrell, P., Ooms, J., Allaire, J.J. (2015),
+  "Recording and Replaying the Graphics Engine Display List",
+  \url{https://stattech.wordpress.fos.auckland.ac.nz/2015/12/21/2015-07-recording-and-replaying-the-graphics-engine-display-list/}
+}
 \seealso{
   The displaylist can be turned on and off using \code{\link{dev.control}}.
   Initially recording is on for screen devices, and off for print devices.