rcu: Use canonical URL for Mathieu's dissertation

The version numbers change too quickly, so use a canonical URL
that represents the most recent version.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1266887105-1528-16-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Documentation/RCU/RTFP.txt

@@ -870,6 +870,6 @@ Revised:
 , month  = "December"
 , year   = 2009
 ,note="Available:
-\url{http://www.lttng.org/pub/thesis/desnoyers-dissertation-2009-12-v24.pdf}
+\url{http://www.lttng.org/pub/thesis/desnoyers-dissertation-2009-12.pdf}
 [Viewed December 9, 2009]"
 }