Update relational-data.Rmd

Hi Hadwick. Thanks for putting this book together. I don't believe these a data frame called carrier and the example here is joining flights2 and airlines by the key carrier.
weirubin · Jun 5, 2016 · 8efd88a · 8efd88a
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@@ -154,7  154,7 @@ Like `mutate()`, the join functions add variables to the right, so if you have a
 
 (When you're in RStudio, you can use `View()` to avoid this problem).
 
-For example, imagine you want to add the full airline name to the `flights` data. You can combine the `airlines` and `carrier` data frames with `left_join()`:
 For example, imagine you want to add the full airline name to the `flights2` data. You can combine the `airlines` and `flights2` data frames with `left_join()`:
 
 ```{r}
 flights2 %>%