[SCSI] stex: update device id info

- add comments for various devices
- remove unused device ids(0xf350, 0x4301, 0x8301, 0x8302)
- add new device id(0xe350)
- fix vendor id of st_vsc
- modify Kconfig help info

Signed-off-by: Ed Lin <ed.lin@promise.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 1b4bfaa..6956909 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -982,8 +982,13 @@
 	tristate "Promise SuperTrak EX Series support"
 	depends on PCI && SCSI
 	---help---
-	  This driver supports Promise SuperTrak EX8350/8300/16350/16300
-	  Storage controllers.
+	  This driver supports Promise SuperTrak EX series storage controllers.
+
+	  Promise provides Linux RAID configuration utility for these
+	  controllers. Please visit <http://www.promise.com> to download.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called stex.
 
 config SCSI_SYM53C8XX_2
 	tristate "SYM53C8XX Version 2 SCSI support"