Merge pull request #1515 from jiho/fix/doc_themes

Add an example for theme_dark in the documentation

Author: hadley

R/theme-defaults.r

@@ -49,6 +49,7 @@
 #' p + theme_bw()
 #' p + theme_linedraw()
 #' p + theme_light()
+#' p + theme_dark()
 #' p + theme_minimal()
 #' p + theme_classic()
 #' p + theme_void()