scsi: update description of logging_level bits

Update the description of 'scsi_logging_level' from 8 4-bit nibbles to
the (pre-git) reality of 10 3-bit bitfields.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Kyle Fortin <kyle.fortin@oracle.com>
Reviewed-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_logging.h

@@ -3,10 +3,10 @@
 
 
 /*
- * This defines the scsi logging feature.  It is a means by which the user
- * can select how much information they get about various goings on, and it
- * can be really useful for fault tracing.  The logging word is divided into
- * 8 nibbles, each of which describes a loglevel.  The division of things is
+ * This defines the scsi logging feature.  It is a means by which the user can
+ * select how much information they get about various goings on, and it can be
+ * really useful for fault tracing.  The logging word is divided into 10 3-bit
+ * bitfields, each of which describes a loglevel.  The division of things is
  * somewhat arbitrary, and the division of the word could be changed if it
  * were really needed for any reason.  The numbers below are the only place
  * where these are specified.  For a first go-around, 3 bits is more than