Update data-transform.qmd (#1214)

Fix wrong wording

data-transform.qmd

@@ -277,7 +277,7 @@ flights |>
 ```
 
 The `.` is a sign that `.before` is an argument to the function, not the name of a new variable.
-You can also use `.after` to add after a variable, and in both `.before` and `.after` you can the name of a variable name instead of a position.
+You can also use `.after` to add after a variable, and in both `.before` and `.after` you can use the variable name instead of a position.
 For example, we could add the new variables after `day:`
 
 ```{r}