[SCSI] config: Make need for SCSI_CDROM clearer

Mention ATAPI. We could insert an essay about libata and ide-scsi etc but
the failure case is someone enables it which is just fine so keep it
simple.

(Revised text from suggestion by Matthew Wilcox)

Closes #7736
Signed-off-by: NAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: NJames Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/Kconfig

@@ -121,10 +121,11 @@ config BLK_DEV_SR
 	tristate "SCSI CDROM support"
 	depends on SCSI
 	---help---
-	  If you want to use a SCSI or FireWire CD-ROM under Linux,
-	  say Y and read the SCSI-HOWTO and the CDROM-HOWTO at
-	  <http://www.tldp.org/docs.html#howto>. Also make sure to say
-	  Y or M to "ISO 9660 CD-ROM file system support" later.
+	  If you want to use a CD or DVD drive attached to your computer
+	  by SCSI, FireWire, USB or ATAPI, say Y and read the SCSI-HOWTO
+	  and the CDROM-HOWTO at <http://www.tldp.org/docs.html#howto>.
+
+	  Make sure to say Y or M to "ISO 9660 CD-ROM file system support".
 
 	  To compile this driver as a module, choose M here and read
 	  <file:Documentation/scsi/scsi.txt>.