Documentation/kernel-parameters: Update rcu_normal_wake_from_gp doc

Update the documentation about rcu_normal_wake_from_gp parameter.

Reviewed-by: Joel Fernandes <[email protected]>
Signed-off-by: Uladzislau Rezki (Sony) <[email protected]>
Reviewed-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Neeraj Upadhyay (AMD) <[email protected]>

Author: urezki

Documentation/admin-guide/kernel-parameters.txt

@@ -5485,7 +5485,8 @@
 			echo 1 > /sys/module/rcutree/parameters/rcu_normal_wake_from_gp
 			or pass a boot parameter "rcutree.rcu_normal_wake_from_gp=1"
 
-			Default is 0.
+			Default is 1 if num_possible_cpus() <= 16 and it is not explicitly
+			disabled by the boot parameter passing 0.
 
 	rcuscale.gp_async= [KNL]
 			Measure performance of asynchronous