tools/memory-model: Fix reference to litmus test in recipes.txt

The name of litmus test doesn't match the one described below.
Fix the name of litmus test.

Acked-by: Andrea Parri <parri.andrea@gmail.com>
Acked-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/memory-model/Documentation/recipes.txt

@@ -126,7 +126,7 @@ However, it is not necessarily the case that accesses ordered by
 locking will be seen as ordered by CPUs not holding that lock.
 Consider this example:
 
-	/* See Z6.0+pooncerelease+poacquirerelease+fencembonceonce.litmus. */
+	/* See Z6.0+pooncelock+pooncelock+pombonce.litmus. */
 	void CPU0(void)
 	{
 		spin_lock(&mylock);