fixed #6642 in trunk as well, sorry i really didn't want to copy this issue ... grrrr

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@12371 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_misdn.c

@@ -1050,7 +1050,7 @@ static struct ast_cli_entry cli_port_down =
 { {"misdn","port","down", NULL},
   misdn_port_down,
   "Tries to deacivate the L1 on the given port", 
-  "Usage: misdn port up <port>\n"
+  "Usage: misdn port down <port>\n"
 };