README: Fix a couple of punctuation errors

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akiyks@gmail.com
Cc: boqun.feng@gmail.com
Cc: dhowells@redhat.com
Cc: j.alglave@ucl.ac.uk
Cc: linux-arch@vger.kernel.org
Cc: luc.maranget@inria.fr
Cc: nborisov@suse.com
Cc: npiggin@gmail.com
Cc: parri.andrea@gmail.com
Cc: stern@rowland.harvard.edu
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1519169112-20593-5-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

tools/memory-model/litmus-tests/README

@@ -23,14 +23,14 @@ IRIW+mbonceonces+OnceOnce.litmus
 	between each pairs of reads.  In other words, is smp_mb()
 	sufficient to cause two different reading processes to agree on
 	the order of a pair of writes, where each write is to a different
-	variable by a different process.
+	variable by a different process?
 
 IRIW+poonceonces+OnceOnce.litmus
 	Test of independent reads from independent writes with nothing
 	between each pairs of reads.  In other words, is anything at all
 	needed to cause two different reading processes to agree on the
 	order of a pair of writes, where each write is to a different
-	variable by a different process.
+	variable by a different process?
 
 ISA2+poonceonces.litmus
 	As below, but with store-release replaced with WRITE_ONCE()