scsi: driver-api: documentation: Change what is added to docbook

scsi: driver-api: documentation: Change what is added to docbook

For scsi_devinfo.c, use :export: so that exported symbols are put into the
docbook. Drop :internal: -- they aren't needed in the docbook.

For scsi_proc.c, drop :internal:. This will cause all documented private
(as is already done) and exported symbols to be added to the docbook.

For scsi_scan.c, switch from :internal: to :export: so that exported
symbols are put into the generated docbook.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20241218000748.932850-1-rdunlap@infradead.org
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>