rcu: Remove "Experimental" flags

After a release or two, features are no longer experimental.  Therefore,
this commit removes the "Experimental" tag from them.

Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
diff --git a/init/Kconfig b/init/Kconfig
index 2d9b831..8df5116 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -656,7 +656,7 @@
 	  Accept the default if unsure.
 
 config RCU_NOCB_CPU
-	bool "Offload RCU callback processing from boot-selected CPUs (EXPERIMENTAL"
+	bool "Offload RCU callback processing from boot-selected CPUs"
 	depends on TREE_RCU || TREE_PREEMPT_RCU
 	default n
 	help