Fix trivial typos in Kconfig* files

Fix several typos in help text in Kconfig* files.

Signed-off-by: David Sterba <dave@jikos.cz>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/usb/serial/Kconfig b/drivers/usb/serial/Kconfig
index ba5d1dc..3efe670 100644
--- a/drivers/usb/serial/Kconfig
+++ b/drivers/usb/serial/Kconfig
@@ -558,7 +558,7 @@
 	tristate "USB Debugging Device"
 	depends on USB_SERIAL
 	help
-	  Say Y here if you have a USB debugging device used to recieve
+	  Say Y here if you have a USB debugging device used to receive
 	  debugging data from another machine.  The most common of these
 	  devices is the NetChip TurboCONNECT device.