vestigial copy= reference

Author: MichaelChirico

NEWS.md

@@ -18,7 +18,7 @@
 
 6. `between()` gains the argument `ignore_tzone=FALSE`. Normally, a difference in time zone between `lower` and `upper` will produce an error, and a difference in time zone between `x` and either of the others will produce a message. Setting `ignore_tzone=TRUE` bypasses the checks, allowing both comparisons to proceed without error or message about time zones.
 
-7. New `frev(x, copy=TRUE)` as a faster analogue to `base::rev()` for atomic vectors/lists, [#5885](https://github.com/Rdatatable/data.table/issues/5885). Twice as fast as `base::rev()` on large inputs, and faster with more threads. Thanks to Benjamin Schwendinger for suggesting and implementing.
+7. New `frev(x)` as a faster analogue to `base::rev()` for atomic vectors/lists, [#5885](https://github.com/Rdatatable/data.table/issues/5885). Twice as fast as `base::rev()` on large inputs, and faster with more threads. Thanks to Benjamin Schwendinger for suggesting and implementing.
 
 ### BUG FIXES