Fix broken cross-refs

data-transform.Rmd

@@ -120,7 +120,7 @@ flights |>
   filter(month %in% c(1, 2))
 ```
 
-We'll come back to these comparisons and logical operators in more detail in Chapter \@ref(logicals-numbers).
+We'll come back to these comparisons and logical operators in more detail in Chapter \@ref(logical).
 
 When you run `filter()` dplyr executes the filtering operation, creating a new data frame, and then prints it.
 It doesn't modify the existing `flights` dataset because dplyr functions never modify their inputs.

logicals.Rmd

@@ -530,7 +530,7 @@ flights |>
   )
 ```
 
-## Making groups
+## Making groups {#groups-from-logical}
 
 Before we move on to the next chapter, I want to show you one last trick.
 I don't know exactly how to describe it, and it feels a little magical, but it's super handy so I wanted to make sure you knew about it.

numbers.Rmd

@@ -458,7 +458,7 @@ lead(x)
     ```
 
 -   `x == lag(x)` tells you when the current value changes.
-    This is often useful combined with the cumulative tricks describe in Section \@ref(cumulative-tricks).
+    This is often useful combined with the grouping trick described in Section \@ref(groups-from-logical).
 
     ```{r}
     x == lag(x)