taskqueue.9: replace ithread(9) with intr_event(9)

Signed-off-by: Miroslav Cimerman <[email protected]>
Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/1845

share/man/man9/taskqueue.9

@@ -530,7 +530,7 @@ If queueing delays cannot be tolerated then a private taskqueue should
 be created with a dedicated processing thread.
 .Sh SEE ALSO
 .Xr callout 9 ,
-.Xr ithread 9 ,
+.Xr intr_event 9 ,
 .Xr kthread 9 ,
 .Xr swi 9
 .Sh HISTORY