firmware_Cr50ConsoleCommands: update help for 0.4.8

BUG=none
BRANCH=none
TEST=run on 0.4.8

Change-Id: I389da5b846b7544a897781e5c1d060fe7b6cc5d0
Signed-off-by: Mary Ruthven <mruthven@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1140738
Reviewed-by: Kevin Shelton <kmshelton@chromium.org>
Commit-Queue: Mary Ruthven <mruthven@chromium.org>
Tested-by: Mary Ruthven <mruthven@chromium.org>
diff --git a/server/site_tests/firmware_Cr50ConsoleCommands/help b/server/site_tests/firmware_Cr50ConsoleCommands/help
index 6255a34..6668952 100644
--- a/server/site_tests/firmware_Cr50ConsoleCommands/help
+++ b/server/site_tests/firmware_Cr50ConsoleCommands/help
@@ -4,7 +4,7 @@
 ccd
 -ccdblock
 ccdstate
--chan
+(?P<mp>-)?chan
 ecrst
 gettime
 gpiocfg