Replace coord_equal in scale-identity.r (#4759)

Author: mmhamdy

R/scale-identity.r

@@ -25,7 +25,7 @@
 #' ggplot(luv_colours, aes(u, v)) +
 #'   geom_point(aes(colour = col), size = 3) +
 #'   scale_color_identity() +
-#'   coord_equal()
+#'   coord_fixed()
 #'
 #' df <- data.frame(
 #'   x = 1:4,