Document the --kernel-variant= option.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5040 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/none/tests/cmdline2.stdout.exp b/none/tests/cmdline2.stdout.exp
index db8349f..d686f75 100644
--- a/none/tests/cmdline2.stdout.exp
+++ b/none/tests/cmdline2.stdout.exp
@@ -23,6 +23,8 @@
     --show-emwarns=no|yes     show warnings about emulation limits? [no]
     --smc-check=none|stack|all  checks for self-modifying code: none,
                               only for code found in stacks, or all [stack]
+    --kernel-variant=variant1,variant2,...  known variants: bproc [none]
+                              handle non-standard kernel variants
 
   user options for Valgrind tools that report errors:
     --xml=yes                 all output is in XML (Memcheck/Nulgrind only)