Adds documentation to show what the w flag.

Patch from Ian Kinner at Digium.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@17283 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_senddtmf.c

@@ -50,7 +50,7 @@ static char *synopsis = "Sends arbitrary DTMF digits";
 
 static char *descrip = 
 " SendDTMF(digits[|timeout_ms]): Sends DTMF digits on a channel. \n"
-" Accepted digits: 0-9, *#abcd\n"
+" Accepted digits: 0-9, *#abcd, w (.5s pause)\n"
 " The application will either pass the assigned digits or terminate if it\n"
 " encounters an error.\n";