Update vignettes/datatable-joins.Rmd

Co-authored-by: Michael Chirico <[email protected]>

Author: venom1204

vignettes/datatable-joins.Rmd

@@ -600,7 +600,7 @@ x[i, on = .(x_int >= i_int), .(i_int = i.i_int, x_int = x.x_int, lower, UPPER)]
 
 Using prefixes (`x.` and `i.`) is not strictly necessary in this case since the names are unambiguous, but using them ensures the output clearly distinguishes `i_int` (from `i`) and `x_int` (from `x`).
 
-If you want to exclude unmatched rows (an _inner join_), you should use `nomatch = NULL`:
+If you want to exclude unmatched rows (an _inner join_), use `nomatch = NULL`:
 
 ```{r}
 x[i, on = .(x_int >= i_int), .(i_int = i.i_int, x_int = x.x_int, lower, UPPER), nomatch = NULL]