help text: remove trailing space

Some help text end with a useless space character.
Remove it.

Change-Id: I397e1194fac8042f0fab694222f925f906716de3
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/6222
Tested-by: jenkins

src/jtag/drivers/cmsis_dap.c

@@ -1763,7 +1763,7 @@ static const struct command_registration cmsis_dap_command_handlers[] = {
 		.handler = &cmsis_dap_handle_vid_pid_command,
 		.mode = COMMAND_CONFIG,
 		.help = "the vendor ID and product ID of the CMSIS-DAP device",
-		.usage = "(vid pid)* ",
+		.usage = "(vid pid)*",
 	},
 	{
 		.name = "cmsis_dap_serial",

src/jtag/drivers/ftdi.c

@@ -1004,7 +1004,7 @@ static const struct command_registration ftdi_command_handlers[] = {
 		.handler = &ftdi_handle_vid_pid_command,
 		.mode = COMMAND_CONFIG,
 		.help = "the vendor ID and product ID of the FTDI device",
-		.usage = "(vid pid)* ",
+		.usage = "(vid pid)*",
 	},
 	{
 		.name = "ftdi_tdo_sample_edge",