rcu: Update documentation regarding kthread_prio cmdline parameter

Inform readers that the priority of RCU no-callback threads will also
be boosted.

Signed-off-by: Alison Chaiken <achaiken@aurora.tech>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Alison Chaiken 2022-01-11 15:32:53 -08:00 • committed by Paul E. McKenney
commit a469948b20