Correct the example of memory orderings in memory-barriers.txt

Commit 615cc2c9 "Documentation/memory-barriers.txt: fix important typo re
memory barriers" changed the assignment to x and y. Change the rest of the
example to match this change.
Reported-by: NGanesh Rapolu <ganesh.rapolu@hotmail.com>
Signed-off-by: NPranith Kumar <bobby.prani@gmail.com>
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>