fix trivial regtest failures


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@3777 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/coregrind/vg_main.c b/coregrind/vg_main.c
index 4120180..a4b839c 100644
--- a/coregrind/vg_main.c
+++ b/coregrind/vg_main.c
@@ -1410,7 +1410,7 @@
 "    --version                 show version\n"
 "    -q --quiet                run silently; only print error msgs\n"
 "    -v --verbose              be more verbose, incl counts of errors\n"
-"    --xml=yes                 show errors as XML\n"
+"    --xml=yes                 all output is in XML (Memcheck only)\n"
 "    --trace-children=no|yes   Valgrind-ise child processes? [no]\n"
 "    --track-fds=no|yes        track open file descriptors? [no]\n"
 "    --time-stamp=no|yes       add timestamps to log messages? [no]\n"