t/README: --valgrind already implies -v

This was missed in 3da93652 (Tests: let --valgrind imply --verbose and
--tee, 2009-02-04).
Signed-off-by: NThomas Rast <trast@inf.ethz.ch>
Acked-by: NJohannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/README

@@ -95,8 +95,7 @@ appropriately before running "make".
 --valgrind::
 	Execute all Git binaries with valgrind and exit with status
 	126 on errors (just like regular tests, this will only stop
-	the test script when running under -i).  Valgrind errors
-	go to stderr, so you might want to pass the -v option, too.
+	the test script when running under -i).
 
 	Since it makes no sense to run the tests with --valgrind and
 	not see any output, this option implies --verbose.  For