SCSI_AACRAID: add a help text

Most of the text by Mark Salyzyn <mark_salyzyn@adaptec.com>.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Mark Salyzyn <mark_salyzyn@adaptec.com>

drivers/scsi/Kconfig

@@ -379,6 +379,14 @@ config SCSI_AHA1740
 config SCSI_AACRAID
 	tristate "Adaptec AACRAID support"
 	depends on SCSI && PCI
+	help
+	  This driver supports a variety of Dell, HP, Adaptec, IBM and
+	  ICP storage products. For a list of supported products, refer
+	  to <file:Documentation/scsi/aacraid.txt>.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called aacraid.
+
 
 source "drivers/scsi/aic7xxx/Kconfig.aic7xxx"