fix syntax error caused by autocompletion

plot.r

 library(ggplot2)
+
+str(iris)
 ggplot(iris) + aes(x = Sepal.Length, y = Sepal.Width, colour = Species) +
-    geom <- point() +
-    geom <- smooth(method = "lm", se = FALSE)
+  geom_point() +
+  geom_smooth(method = "lm", se = FALSE)
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