scsi: scsi_lib: Add kernel-doc for exported functions

scsi: scsi_lib: Add kernel-doc for exported functions

Add kernel-doc for scsi_failures_reset_retries() and scsi_alloc_request()
since these are exported.  This allows them to be part of the SCSI
driver-api docbook.

Fix kernel-doc comments for scsi_vpd_tpg_id() [add kernel-doc for one
parameter and fix a typo].

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20241212205217.597844-4-rdunlap@infradead.org
CC: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
CC: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>