USB: storage: remove invalid URL from drivers

The old URL for usb-storage driver help is long gone.  So remove it from
the comments to not confuse people anymore.

Reported-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/storage/protocol.h

@@ -19,9 +19,6 @@
  *
  * Also, for certain devices, the interrupt endpoint is used to convey
  * status of a command.
- *
- * Please see http://www.one-eyed-alien.net/~mdharm/linux-usb for more
- * information about this driver.
  */
 
 #ifndef _PROTOCOL_H_