Fix coord_polar example

Author: wch

R/coord-polar.r

@@ -35,9 +35,9 @@
 #'   value = c(80, 20)
 #' )
 #' ggplot(df, aes(x = "", y = value, fill = variable)) + 
-#'   geom_bar(width = 1) + 
+#'   geom_bar(width = 1, stat = "identity") +
 #'   scale_fill_manual(values = c("red", "yellow")) + 
-#'   coord_polar("y", start=pi / 3) + 
+#'   coord_polar("y", start = pi / 3) +
 #'   labs(title = "Pac man")
 #' 
 #' # Windrose + doughnut plot