doc: Add rcuog kthreads to kernel-per-CPU-kthreads.rst

This commit adds the rcuog kthreads to the list of callback-offloading
kthreads that can be affinitied away from worker CPUs.

Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Neeraj Upadhyay <[email protected]>
Signed-off-by: Frederic Weisbecker <[email protected]>

Author: paulmckrcu

Documentation/admin-guide/kernel-per-CPU-kthreads.rst

@@ -315,7 +315,7 @@ To reduce its OS jitter, do at least one of the following:
 	to do.
 
 Name:
-  rcuop/%d and rcuos/%d
+  rcuop/%d, rcuos/%d, and rcuog/%d
 
 Purpose:
   Offload RCU callbacks from the corresponding CPU.