Fix example bug caused by inconsistent legend theming

Author: hadley

R/guide-legend.r

@@ -89,7 +89,8 @@
 #'     title.theme = element_text(
 #'       size = 15,
 #'       face = "italic",
-#'       colour = "red"
+#'       colour = "red",
+#'       angle = 0
 #'     )
 #'   )
 #' )