rcuscale: Fix gp_async_max typo: s/reader/writer/

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

kernel/rcu/rcuscale.c

@@ -84,7 +84,7 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.ibm.com>");
 #endif
 
 torture_param(bool, gp_async, false, "Use asynchronous GP wait primitives");
-torture_param(int, gp_async_max, 1000, "Max # outstanding waits per reader");
+torture_param(int, gp_async_max, 1000, "Max # outstanding waits per writer");
 torture_param(bool, gp_exp, false, "Use expedited GP wait primitives");
 torture_param(int, holdoff, 10, "Holdoff time before test start (s)");
 torture_param(int, nreaders, -1, "Number of RCU reader threads");