usb/serial: fix grammar in Kconfig help text for FTDI_SIO

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index a69f7cd..9cfb56d 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -170,7 +170,7 @@
 	---help---
 	  Say Y here if you want to use a FTDI SIO single port USB to serial
 	  converter device. The implementation I have is called the USC-1000.
-	  This driver has also be tested with the 245 and 232 devices.
+	  This driver has also been tested with the 245 and 232 devices.
 
 	  See <http://ftdi-usb-sio.sourceforge.net/> for more
 	  information on this driver and the device.