rcu: Fix Documentation typo 'CONFIG_RCU_NOCB_CPUS'

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/Documentation/kernel-per-CPU-kthreads.txt b/Documentation/kernel-per-CPU-kthreads.txt
index cbf7ae4..d0fcc5b 100644
--- a/Documentation/kernel-per-CPU-kthreads.txt
+++ b/Documentation/kernel-per-CPU-kthreads.txt
@@ -185,7 +185,7 @@
 To reduce its OS jitter, do at least one of the following:
 1.	Use affinity, cgroups, or other mechanism to force these kthreads
 	to execute on some other CPU.
-2.	Build with CONFIG_RCU_NOCB_CPUS=n, which will prevent these
+2.	Build with CONFIG_RCU_NOCB_CPU=n, which will prevent these
 	kthreads from being created in the first place.  However, please
 	note that this will not eliminate OS jitter, but will instead
 	shift it to RCU_SOFTIRQ.