Doc fix: echo writes to the log, and not to stdout

Fixes bug #202

Change-Id: I855a1b8570af71379891634f405b4cc726917cb2
Signed-off-by: R. Diez <rdiezmail-openocd@yahoo.de>
Reviewed-on: http://openocd.zylin.com/6272
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/helper/command.c

@@ -1222,7 +1222,6 @@ static const struct command_registration command_builtin_handlers[] = {
 		.handler = jim_echo,
 		.mode = COMMAND_ANY,
 		.help = "Logs a message at \"user\" priority. "
-			"Output message to stdout. "
 			"Option \"-n\" suppresses trailing newline",
 		.usage = "[-n] string",
 	},